Orchids are admired for their elegant flowers, fascinating growth habits, and remarkable variety. From the popular moth orchid found in homes and garden centers to colorful Cattleya and Dendrobium varieties, these plants offer options for many different growing environments.
An orchid is a flowering plant belonging to the family Orchidaceae. Many popular indoor orchids grow naturally on trees, where their roots receive air and moisture rather than remaining buried in ordinary garden soil.
Although orchids sometimes have a reputation for being difficult to grow, many varieties thrive indoors when their basic requirements are understood. The key is to provide appropriate light, water, airflow, temperature, and growing media for the particular type of orchid.
In this guide, you will learn about popular orchid varieties, flower colors and meanings, indoor growing conditions, watering, repotting, common problems, and ways to encourage healthy flowering.
What Is an Orchid?
An orchid is a flowering plant in the botanical family Orchidaceae. Orchids grow in a wide range of habitats, from tropical rainforests to cooler mountain environments. Their flowers come in numerous shapes, sizes, patterns, and colors.
Many orchids sold as houseplants are tropical species or hybrids selected for their attractive flowers and ability to grow in controlled indoor environments.
Key characteristics of orchids
Orchids have several distinctive features:
- Specialized flowers: Orchid flowers typically have three sepals and three petals, with one petal often modified into a distinctive structure called a lip or labellum.
- Specialized reproductive structures: Most orchids have a reproductive structure called a column, which combines parts of the flower’s reproductive system.
- Adapted roots: Many popular orchids have thick roots adapted to absorb moisture and nutrients while receiving plenty of air.
- Different growth habits: Some orchids grow on trees, others grow on rocks, and some grow in the ground.
- Varied flowering patterns: Depending on the species or hybrid, flowers may appear on upright spikes, arching stems, or clusters.
Orchids are not a single type of flower with identical care requirements. Their needs vary according to their natural habitat, growth habit, and individual variety.
Scientific Classification and Characteristics of Orchids
Orchids belong to the family Orchidaceae, one of the major families of flowering plants.
| Classification | Description |
|---|---|
| Kingdom | Plantae |
| Division | Flowering plants (angiosperms) |
| Order | Asparagales |
| Family | Orchidaceae |
| Common name | Orchid |
Orchids have adapted to many environments. Understanding their natural growth habits can help explain why they need different types of care.
Epiphytic orchids
Epiphytic orchids grow on other plants, often on tree branches. They use the tree as a physical support rather than taking nutrients directly from it as a parasite would.
Their exposed roots absorb moisture and nutrients from rain, humidity, and surrounding organic material. This is why many popular epiphytic orchids grow best in an airy medium instead of ordinary garden soil.
Terrestrial orchids
Terrestrial orchids grow in the ground. Their roots are adapted to the soil conditions of their natural habitat, which can differ substantially from the conditions preferred by epiphytic orchids.
Lithophytic orchids
Lithophytic orchids grow on rocks or rocky surfaces. Their roots are adapted to the particular moisture, drainage, and airflow conditions found in those locations.
Why does this matter? Identifying an orchid’s general growth habit helps you choose an appropriate potting medium and avoid treating every orchid as if it were the same houseplant.
Different Types of Orchids
There are many orchid genera, species, and cultivated hybrids. Some are better suited to typical indoor environments than others.
The following varieties are useful starting points for anyone exploring orchids for home growing.
1. Phalaenopsis Orchids
Phalaenopsis orchid, commonly called moth orchids, are among the most popular orchids for indoor cultivation.
Their flowers often appear along arching spikes and can remain attractive for an extended period. Available colors include white, pink, purple, yellow, and combinations of several shades.
General care requirements:
- Bright, indirect light
- Warm indoor temperatures
- Watering when the growing medium approaches dryness
- An airy, well-draining orchid mix
- Good air circulation around the roots
Phalaenopsis orchids are commonly recommended for beginners because many cultivated varieties adapt well to normal household conditions. The Royal Horticultural Society provides a practical overview of their care in its Phalaenopsis growing guide.
Best for: Beginners, desks, bright living rooms, and indoor flowering displays.
2. Cattleya Orchids
Cattleya orchid orchids are known for their large, showy flowers. Some varieties are also valued for their fragrance.
Cattleya orchids generally need brighter light than Phalaenopsis orchids. Many have thickened stems called pseudobulbs, which help store water and nutrients.
General care requirements:
- Bright filtered light
- An airy, fast-draining growing medium
- Watering adjusted to the plant’s growth and drying conditions
- Good air circulation
- Appropriate seasonal rest or reduced watering for varieties that require it
Best for: Growers who can provide bright light and want prominent flowers.
3. Dendrobium Orchids
Dendrobium orchid is a large and varied orchid genus. Its members differ in temperature preferences, growth habits, and flowering patterns.
Many Dendrobium orchids produce flowers along upright canes. Some varieties flower most successfully when their seasonal temperature and watering needs are met.
General care requirements:
- Light levels appropriate to the particular variety
- An airy growing medium for epiphytic types
- Good drainage
- Appropriate temperature conditions
- Seasonal care adjusted to the variety’s natural growth cycle
Best for: Growers willing to identify their specific orchid and follow its seasonal requirements.
4. Oncidium Orchids
Oncidium orchid orchids are often recognized by branching flower spikes carrying numerous small blooms. Some are nicknamed dancing-lady orchids because of the shapes of their flowers.
Many Oncidium types prefer bright, filtered light and good airflow. Their watering needs depend on the plant’s roots, potting medium, and growing conditions.
General care requirements:
- Bright, filtered light
- Good drainage
- Regular observation of moisture levels
- Air circulation
- Care appropriate to the individual hybrid or species
Best for: People who enjoy abundant sprays of smaller flowers.
5. Paphiopedilum Orchids
Paphiopedilum orchid orchids are known as slipper orchids because their pouch-shaped flowers resemble small slippers.
Unlike many common epiphytic orchids, Paphiopedilum orchids are generally terrestrial or grow in humus-rich material. Their growing medium should retain some moisture while remaining sufficiently airy.
General care requirements:
- Low to moderate light, depending on the variety
- A well-aerated medium that does not dry out excessively
- Moisture kept reasonably consistent without waterlogging
- Temperature conditions suited to the particular species or hybrid
Best for: Growers seeking unusual flowers or orchids that prefer less intense light.
Orchid varieties compared
| Orchid type | General light preference | Beginner suitability | Notable feature |
|---|---|---|---|
| Phalaenopsis | Bright, indirect | Often excellent | Long-lasting flowers |
| Cattleya | Bright | Moderate | Large, showy flowers |
| Dendrobium | Varies by type | Moderate | Flowers along canes |
| Oncidium | Bright, filtered | Moderate | Branching sprays of flowers |
| Paphiopedilum | Low to moderate, depending on type | Moderate | Slipper-shaped blooms |
These are broad comparisons, not universal rules. Check the requirements of the exact orchid you buy before choosing its location and watering routine.
Popular Orchid Colors and Their Meanings
Orchid flowers appear in many colors, including white, pink, purple, yellow, orange, red, and green. Some flowers also feature spots, stripes, contrasting lips, or multiple colors.
People often associate different orchid colors with particular emotions or occasions. These meanings are symbolic rather than botanical facts, and they vary between cultures and traditions.
| Orchid color | Common symbolic associations | Possible use |
|---|---|---|
| White | Elegance, purity, simplicity | Weddings, formal displays, thoughtful gifts |
| Pink | Affection, admiration, grace | Birthdays, celebrations, appreciation |
| Purple | Royalty, admiration, luxury | Decorative arrangements and special gifts |
| Yellow | Friendship, warmth, happiness | Thank-you gifts and cheerful displays |
| Red | Love, passion, strength | Romantic occasions |
| Orange | Enthusiasm, energy, confidence | Celebrations and bright interiors |
| Green | Nature, renewal, harmony | Plant-themed gifts and contemporary displays |
When selecting an orchid as a gift, consider the recipient’s preferences and the occasion rather than assuming a color has one universal meaning.
How to Care for Orchids
Successful orchid care depends on balancing light, water, air, temperature, humidity, and nutrients. The right balance differs among orchid types.
The American Orchid Society’s orchid care resources explain these factors in more detail and provide guidance for different growing conditions.
Choosing the Right Orchid Plant
If you are buying your first orchid, start with a variety suited to your home.
A Phalaenopsis orchid is often a practical choice because it generally grows well in warm rooms with bright, indirect light.
Before purchasing an orchid, look for:
- Firm leaves without extensive soft or blackened areas
- Roots that are generally firm rather than mushy
- A plant that sits securely in its pot
- No obvious signs of pests
- A potting medium that is not persistently waterlogged
- A plant label identifying the orchid type, if available
Some orchid roots naturally appear silvery, green, or other colors depending on the species and moisture level. Root color alone does not establish whether a plant is healthy.
If you are buying an orchid in bloom, also inspect the leaves and roots. Attractive flowers do not necessarily indicate that the root system is healthy.
Orchid Light Requirements
Light is one of the most important factors affecting orchid growth and flowering.
Many popular indoor orchids prefer bright, indirect light. However, the exact requirements depend on the type of orchid.
General lighting guidance:
- Phalaenopsis: Usually grows well near a bright east-facing window or behind a sheer curtain.
- Cattleya: Generally needs brighter light than Phalaenopsis.
- Dendrobium: Light requirements vary by species and hybrid.
- Oncidium: Often prefers bright, filtered light.
- Paphiopedilum: Many varieties prefer lower light than Cattleya.
A window that provides gentle morning sunlight may be a good starting point for a Phalaenopsis orchid. Strong afternoon sunlight through glass can overheat or scorch leaves.
Signs of insufficient light
An orchid may struggle to flower if it receives too little light. Dark green leaves can sometimes indicate that the plant would benefit from more light, although leaf color varies by variety.
Signs of excessive light
Possible signs include bleached patches, reddish discoloration, or dry, scorched areas.
Practical tip: Increase light gradually and observe the plant’s response instead of moving it immediately into strong direct sunlight.
How Often Should You Water an Orchid?
There is no single watering schedule that works for every orchid.
Watering frequency depends on several factors:
- Orchid species or hybrid
- Pot size and material
- Growing medium
- Indoor temperature
- Humidity
- Light levels
- Air circulation
- Season and current growth
A small orchid in coarse bark in a warm room may dry faster than a larger orchid in a cooler room with a moisture-retentive medium.
How to water an orchid correctly
- Check the growing medium and the condition of the roots.
- Water thoroughly when the medium is approaching dryness, according to the needs of the orchid type.
- Allow excess water to drain from the pot.
- Avoid leaving the pot sitting in stagnant water.
- Keep water from collecting in the crown of a Phalaenopsis orchid, where the leaves meet.
- Adjust watering as indoor conditions change.
For many Phalaenopsis orchids, roots appear green after becoming wet and may become silvery as they dry. This can be a useful clue when combined with checking the medium and pot weight.
Do not rely on root color alone, and do not apply the same watering schedule to every orchid.
Should you water orchids with ice cubes?
Ice cubes are not the preferred general watering method for tropical orchids. Instead, use room-temperature water and thoroughly moisten the growing medium when the plant needs water, then let it drain.
Common watering mistakes
Avoid:
- Watering automatically on a fixed schedule without checking moisture
- Leaving roots in standing water
- Using an excessively dense medium that stays wet too long
- Allowing a moisture-sensitive orchid to become excessively dry
- Ignoring seasonal changes in drying time
The University of Maryland Extension’s Phalaenopsis care guide provides additional practical watering and repotting advice.
Choosing the Right Orchid Potting Mix
Many popular orchids grow naturally on trees or other surfaces rather than in ordinary garden soil. Their roots need oxygen as well as moisture.
For these orchids, a suitable growing medium should provide:
- Good drainage
- Adequate airflow
- Enough moisture retention to support the roots
- A structure that does not break down too quickly
Common orchid growing media include:
- Orchid bark: Provides air spaces and drainage; widely used for epiphytic orchids.
- Sphagnum moss: Retains more moisture and may suit certain orchids or growing environments.
- Perlite: Can improve aeration when used as part of an appropriate mix.
- Specialized orchid mixes: Often combine bark with other ingredients to balance moisture retention and airflow.
The best choice depends on the orchid, pot, indoor environment, and watering habits.
Avoid using ordinary, dense potting soil for most epiphytic orchids. It may retain too much water and restrict the airflow their roots need. Terrestrial orchids can have different requirements, so identify your plant before choosing a medium.
Maintaining Proper Humidity and Temperature
Many commonly grown orchids originate in environments with more humidity than typical indoor air provides. However, humidity preferences vary by species.
To support healthy growth:
- Avoid placing orchids directly beside heating vents or air conditioners.
- Maintain gentle air circulation.
- Keep the plant away from extreme temperature fluctuations.
- Consider a humidifier if the air is consistently very dry.
- Use a humidity tray only as a supplementary measure, ensuring that the pot does not sit in water.
Misting is not a reliable substitute for appropriate watering or room humidity. It can also leave water in the crown or on flowers if done carelessly.
For Phalaenopsis orchids, the American Orchid Society recommends bright light, warm growing conditions, appropriate humidity, and good airflow. Its detailed recommendations are available in the Phalaenopsis culture sheet.
Fertilizing Orchids Correctly
Orchids need nutrients for healthy roots, leaves, and flowers, but excessive fertilizer can damage roots and contribute to salt accumulation in the growing medium.
A practical approach is to:
- Choose a fertilizer suitable for orchids.
- Follow the label’s dilution instructions.
- Apply fertilizer during active growth as appropriate for the orchid type.
- Reduce or adjust feeding when growth slows.
- Occasionally water with plain water to help flush accumulated salts from the medium.
Do not assume that a high-phosphorus fertilizer is always necessary to trigger flowering. Healthy growth, appropriate light, and the correct seasonal conditions are more fundamental.
Important: More fertilizer does not automatically produce more flowers. Overfeeding can harm the plant.
How to Grow Orchids Indoors
Growing orchids indoors becomes easier when the plant’s natural needs are considered.
Step 1: Choose an appropriate location
Start with a bright location away from harsh direct sunlight, especially for Phalaenopsis orchids.
An east-facing window is often a good starting point. A shaded south- or west-facing window may also work, depending on local sunlight intensity and the plant’s needs.
Step 2: Use a suitable pot
Choose a pot with adequate drainage holes. Some orchid growers use transparent pots because they make it easier to observe the roots and moisture conditions.
The pot should fit the root system reasonably well. An excessively large pot can hold more moisture than the roots can use, increasing the risk of root problems.
Step 3: Check the growing medium
Make sure the medium matches the orchid’s growth habit and does not remain waterlogged.
If the bark has broken down into fine material, drains poorly, or stays wet much longer than before, it may be time to repot.
Step 4: Develop a watering routine
Observe the plant and its environment rather than watering automatically every few days.
Check the medium, pot weight, and root condition. Over time, you will learn how quickly the plant dries under your home’s conditions.
Step 5: Monitor growth
Healthy growth may include new leaves, roots, pseudobulbs, or flower spikes, depending on the orchid.
If the plant is not flowering, check the light first, then review its watering, root health, temperature, and seasonal requirements.
How to Repot an Orchid Plant
Repotting refreshes the growing medium and provides space for healthy roots. It is not necessary to repot every orchid immediately after purchasing it, but it is important to check whether the existing medium is suitable and in good condition.
When should you repot an orchid?
Consider repotting when:
- The growing medium has broken down.
- The medium remains wet for too long.
- Roots are rotting because of poor aeration or drainage.
- The plant has outgrown its container.
- The medium has become compacted or contaminated.
- The orchid’s growth habits make a different pot or medium more appropriate.
Many commonly grown Phalaenopsis orchids need fresh growing medium roughly every one to three years, depending on the medium and growing conditions. The plant’s condition matters more than following a rigid calendar.
Steps for repotting
1. Prepare the new pot.
Choose a clean pot with good drainage. It should accommodate the roots without leaving an excessive amount of unused medium.
2. Remove the orchid carefully.
Gently ease the plant out of its container. If roots are attached to the pot or medium, take your time to avoid unnecessary damage.
3. Remove old growing medium.
Carefully loosen degraded bark or other material from around the roots.
4. Inspect the roots.
Healthy roots are generally firm. Remove roots that are clearly dead, hollow, or mushy using clean, sharp cutting tools.
Do not remove firm roots solely because they are brown or another unexpected color. Some healthy roots become discolored by their environment.
5. Add fresh medium.
Position the plant appropriately for its growth habit and gently work the new medium around the roots.
6. Check the plant’s position.
Avoid burying the crown or stem base of a Phalaenopsis orchid under the growing medium.
7. Water appropriately.
Follow the needs of the orchid and the fresh medium. Ensure that excess water drains freely.
After repotting, keep the orchid in suitable light and monitor it for signs of stress. Avoid unnecessary fertilizer or repeated disturbance while it establishes itself.
How to Make an Orchid Bloom Again
An orchid that has finished flowering is not necessarily dying. Many orchids naturally alternate between flowering and vegetative growth.
The best way to encourage repeat flowering is to maintain healthy roots and leaves while providing the conditions needed by the particular variety.
1. Provide sufficient light
Insufficient light is a common reason that otherwise healthy indoor orchids fail to flower.
Check whether the plant receives enough bright, indirect light. Increase exposure gradually if needed, and avoid leaf scorch.
2. Maintain healthy roots
Damaged roots reduce the plant’s ability to absorb water and nutrients.
Review the growing medium, drainage, and watering routine if roots appear mushy, hollow, or persistently unhealthy.
3. Follow the orchid’s temperature needs
Some orchids respond to seasonal temperature changes when initiating flower spikes. Others have different flowering cues.
Learn the requirements of your specific variety instead of deliberately exposing every orchid to cold temperatures.
4. Fertilize sensibly
Provide suitable nutrients during active growth, following the fertilizer label. Excessive feeding cannot compensate for inadequate light or unhealthy roots.
5. Manage the flower spike appropriately
After flowering, the best approach depends on the orchid and the condition of its spike.
For a Phalaenopsis orchid:
- A green spike may sometimes produce another flowering branch.
- A brown or completely dried spike can generally be removed.
- Cutting a green spike back may encourage branching in some plants, but it does not guarantee another flush of flowers.
- Cutting the spike near its base allows the plant to direct resources toward new growth and a future spike.
Other orchid types may have different flowering habits, so do not apply the same pruning rule to all orchids.
How Long Do Orchid Flowers Last?
Orchid flower longevity varies by species, hybrid, and growing conditions.
Many popular Phalaenopsis orchids can keep their flowers for several weeks to several months under suitable conditions. Other orchids may have shorter flowering periods, and individual blooms on the same plant may open at different times.
Factors that influence flower longevity include:
- Orchid variety
- Plant health
- Temperature
- Light conditions
- Sudden environmental changes
- Water stress
- Handling of the flowers
To help flowers last longer, maintain stable conditions and avoid placing the plant beside hot air vents, cold drafts, or ripening fruit. Do not allow water to collect on the flowers, as this can damage their appearance.
When the flowers fall, continue caring for the plant. Healthy roots and leaves provide the foundation for future flowering.
Common Orchid Problems and Solutions
Orchid problems can have several causes, and one symptom does not always indicate a single diagnosis. Examine the roots, growing medium, environment, and overall growth before deciding what to change.
| Problem | Possible causes | Recommended response |
|---|---|---|
| Yellow leaves | Natural aging, excessive light, watering problems, or root damage | Check which leaves are affected, assess light, and inspect the roots. |
| Mushy brown roots | Root rot associated with prolonged wetness or poor aeration | Review drainage, remove clearly rotted roots when appropriate, and repot if the medium has deteriorated. |
| Wrinkled leaves | Water stress, damaged roots, or inadequate water uptake | Check root health and the medium before increasing watering. |
| No flowers | Insufficient light, immature growth, seasonal factors, or unsuitable conditions | Check light and the variety’s flowering requirements. |
| Buds falling before opening | Temperature changes, environmental stress, or other growing problems | Stabilize conditions and inspect the plant for stress. |
| Dry or shriveled roots | Insufficient moisture, damaged roots, or unsuitable growing conditions | Check the medium and root system; adjust watering to the orchid type. |
| White or crusty deposits on the medium | Possible mineral or fertilizer salt accumulation | Review fertilizer use and water quality; flush the medium if appropriate. |
Why are my orchid leaves turning yellow?
A single older leaf turning yellow may be part of the plant’s normal aging process. However, multiple yellowing leaves may indicate excessive light, watering problems, or root damage.
Check whether the medium is staying wet for too long and whether the roots remain firm. Also assess the plant’s exposure to sunlight.
Do not automatically increase watering simply because a leaf looks yellow. If the roots are damaged, adding more water may worsen the problem.
Why are my orchid roots turning brown?
Root color varies, and brown roots are not always dead. The more useful indicators are texture, firmness, and condition.
- Firm roots: May still be functional even if their color is unusual.
- Mushy roots: May indicate rot or tissue breakdown.
- Hollow or collapsed roots: May be dead or severely damaged.
- Roots in a persistently wet medium: May be at greater risk of rot if airflow is poor.
Inspect the entire root system and growing medium before deciding whether to repot.
Why is my orchid not flowering?
Insufficient light is one possible cause, but it is not the only one.
Other factors include:
- An immature plant
- Damaged roots
- Inadequate overall growing conditions
- A seasonal rest period
- Temperature conditions unsuitable for the variety
- Recent environmental stress
Begin by reviewing light exposure and root health. Then check the care requirements for the specific orchid.
Orchid Care After Flowering
Once an orchid finishes flowering, its needs do not necessarily change dramatically. Many orchids continue growing leaves and roots before producing another flower spike.
After flowering:
- Check whether the flower spike is still green or has become brown and dry.
- Prune only when appropriate for the orchid type.
- Continue watering according to the plant’s growing conditions.
- Fertilize appropriately during active growth.
- Check whether the growing medium needs replacement.
- Maintain suitable light and temperature.
- Watch for new leaves, roots, or flower spikes.
Avoid discarding a healthy orchid simply because its flowers have fallen. The end of a flowering period is a normal part of the plant’s growth cycle.
Benefits and Uses of Orchids
Orchids are valued primarily for their ornamental flowers, variety, and suitability for decorative displays.
Decorative value
Orchids can add color and visual interest to homes, offices, reception areas, and indoor gardens.
Different varieties offer different flower shapes, sizes, and growth habits, allowing people to select plants that suit their space.
Gift-giving
Orchids are often presented as gifts for birthdays, anniversaries, celebrations, and formal occasions. Their symbolic associations with elegance, admiration, and affection can make them suitable for many events.
Educational interest
Orchids are also fascinating subjects for plant enthusiasts because of their specialized flowers, varied habitats, and diverse pollination strategies.
A hobby for plant enthusiasts
Growing orchids encourages careful observation of roots, leaves, growth cycles, and environmental conditions. Keeping a simple record of watering and flowering can help growers understand what works for their particular plants.
Important: Orchids should not be assumed to provide medical benefits or purify indoor air to a meaningful degree without reliable evidence for the specific claim.
Frequently Asked Questions About Orchids
1. What is an orchid?
An orchid is a flowering plant in the family Orchidaceae. Orchids are known for their distinctive flower structures and variety of shapes, colors, and growth habits. Many types are grown as ornamental houseplants.
2. How often should you water an orchid?
Watering frequency depends on the orchid type, growing medium, pot, temperature, humidity, and light levels. Check the medium and roots rather than following a rigid weekly schedule. Water thoroughly when appropriate, and allow excess water to drain.
3. Are orchids easy to grow indoors?
Many orchids can grow successfully indoors. Phalaenopsis orchids are especially popular because they generally tolerate normal household temperatures and bright, indirect light. Choosing an orchid suited to your home makes care easier.
4. How long do orchid flowers last?
Flower longevity varies by orchid variety and growing conditions. Many popular Phalaenopsis orchids can display flowers for several weeks to several months. Stable temperatures, appropriate light, and healthy plant growth help maintain flowering.
5. How do you make an orchid bloom again?
Provide sufficient light, maintain healthy roots, and meet the plant’s temperature and seasonal requirements. Continue appropriate care after the flowers fade. For Phalaenopsis orchids, a green flower spike may produce another branch, while a completely dry spike can generally be removed.
6. What is the best orchid for beginners?
Phalaenopsis is often recommended for beginners because it is widely available and many cultivated varieties adapt well to indoor conditions. Before buying, consider the light, temperature, and space available in your home.
7. Why are my orchid leaves turning yellow?
Yellow leaves may result from normal aging, excessive light, watering problems, or damaged roots. Check the overall plant, inspect the roots, and assess the growing medium before changing your watering routine.
8. Can orchids grow in ordinary potting soil?
Many popular epiphytic orchids should not be grown in dense, ordinary potting soil because it may restrict airflow and retain excessive moisture around their roots. These orchids generally need an airy, well-draining medium, often containing bark. Terrestrial orchids may have different growing requirements.
9. How do you know when an orchid needs repotting?
An orchid may need repotting when its medium breaks down, drainage becomes poor, roots deteriorate, or the plant outgrows its container. Many Phalaenopsis orchids benefit from fresh growing medium approximately every one to three years, depending on conditions.