How to Care for Orchids: The Complete Phalaenopsis Growing Guide

Learn how to care for orchids — especially Phalaenopsis moth orchids — with complete guidance on light, watering, humidity, potting medium, repotting, and getting them to rebloom year after year.

Orchids have a reputation for being temperamental, demanding, and difficult — a reputation that the Phalaenopsis moth orchid does almost nothing to deserve. The most widely available orchid genus in the United States, Phalaenopsis is genuinely beginner-friendly: tolerant of typical home light levels, forgiving of occasional missed waterings, long-blooming (individual flowers last weeks; entire bloom spikes often 2 to 3 months), and capable of reblooming reliably year after year when given consistent basic care.

The key to successful orchid growing is understanding that these plants don’t grow in soil — they grow on bark, on tree branches, and on rocky surfaces in their natural tropical habitat. This single fact explains everything about orchid care: why their potting medium is bark rather than soil, why their roots need air as much as moisture, why overwatering kills them, and why those long silvery-green aerial roots trailing outside the pot are completely normal and healthy rather than a problem to be tucked away.

At Outz News Garden, Maria Walker covers the complete orchid care guide — focused primarily on Phalaenopsis as the most widely grown and accessible orchid for home gardeners, with notes on the closely related Paphiopedilum (slipper orchid) for those who want to expand their collection. For more excellent low-maintenance houseplants that companion orchids beautifully, see our guides on peace lily care and snake plant care.

Understanding Phalaenopsis: The Orchid for Every Home

According to University of Maryland Extension’s Phalaenopsis care guide, Phalaenopsis orchids (Phals), also known as moth orchids, have probably increased the allure of orchid culture for the general public more than any other orchid genus. They are mass produced and reasonably priced, readily available in big box stores, and the many hybrids are very easy to grow and flower under most home conditions.

In nature, Phalaenopsis orchids grow on tree trunks and branches in the warm sections of the tropics worldwide — hanging on tree bark and sending out aerial roots along their stems. This epiphytic (tree-dwelling) lifestyle explains their cultural requirements completely: they need air around their roots, excellent drainage, and the bright but indirect light that filters through a tropical forest canopy.

University of Maryland Extension notes that flower stalks initiate and grow out from the leaf joints or axils, often setting multiple flower buds, with flowers that can last at least a month or longer if the plant is provided proper care.

The Slipper Orchid: An Excellent Second Choice

According to Penn State Extension’s orchid houseplant guide, there are two genera of orchids whose requirements are similar to those of most homes: Paphiopedilum (slipper orchids) and Phalaenopsis. Both make excellent indoor plants, and both can be grown successfully by beginner orchid enthusiasts.

Paphiopedilum (Paphs), called slipper orchids for their pouch-shaped lip, grow on the shaded floor of tropical forests where temperatures are warm and humidity is high. Penn State Extension specifies that indoors, slipper orchids generally require a temperature range of 60°F at night to no more than 90°F during the day, benefit from low light (east or west window), and prefer potting media that doesn’t dry out completely between waterings — slightly more moisture-tolerant than Phalaenopsis. Their terrestrial (ground-dwelling) origin means they grow in a richer, more moisture-retentive potting mix than their epiphytic cousins.

Light: The Most Important Factor for Reblooming

University of Maryland Extension identifies light exposure as one of the most important factors for re-flowering — and names low light levels as the most common cause for not re-flowering in orchids that otherwise appear healthy.

• Best location: east or west-facing window. University of Maryland Extension confirms that Phalaenopsis orchids do well under normal room temperatures with indirect light from an east or west window.
• South-facing window: acceptable if shielded from direct afternoon sun by a sheer curtain — bright direct sun bleaches Phal leaves and can cause sunburn. The bright but indirect light of a south window behind a sheer curtain is actually excellent for robust growth and flowering.
• North-facing window: Penn State Extension’s orchid guide notes that for slipper orchids, a north window will probably not have enough light — the same applies to Phalaenopsis. North windows provide insufficient light for reliable reblooming in most situations.
• Signs of insufficient light: dark green, floppy leaves; failure to initiate flower spikes despite otherwise good care; long intervals between bloom cycles
• Signs of too much direct sun: pale, yellowish leaves; white or tan bleached patches on leaf surfaces; limp, dehydrated appearance despite adequate watering

Watering Orchids: The Most Critical Skill

More orchids are killed by overwatering than by any other cause — and the failure mode is root rot, which develops insidiously beneath bark that appears dry on top while the roots below are suffocating in constantly wet conditions. The correct watering approach for Phalaenopsis is the most important skill to develop.

Understanding Orchid Root Needs

According to University of Minnesota Extension, as houseplants, moth orchids (Phalaenopsis) are grown in bark to provide moisture and adequate air to the roots — the two needs that must be balanced simultaneously. University of Maryland Extension specifies watering from the top for most houseplants but notes that plants in soilless mixes (like orchid bark) can also benefit from bottom watering, where the pot is placed in water for an hour to allow the bark to absorb moisture thoroughly before draining.

The Correct Watering Approach

• Check the bark: push a finger into the bark medium to 1 to 2 inches depth. Water only when the bark feels almost completely dry — not bone dry, but no longer detectably moist. This usually means watering every 7 to 14 days depending on season, pot size, and home humidity.
• Water thoroughly: when watering, pour water slowly and evenly over the bark until it flows freely from all drainage holes — ensuring the entire bark column is wetted, not just the top layer
• Allow complete drainage: after watering, allow the pot to drain completely — never let orchids sit in water-filled saucers. Sitting water at the base of the pot keeps bark roots perpetually wet and anaerobic.
• Room-temperature water: cold tap water can cause cold shock to tropical orchid roots. Allow tap water to reach room temperature before using, or use filtered water to minimize fluoride and chlorine exposure.
• Reduce in winter: lower light levels in winter slow Phal metabolism — reduce watering frequency accordingly, allowing the bark to dry more completely between waterings than in the summer growing season.

Aerial Roots — Leave Them Alone

University of Maryland Extension is explicit: for Phalaenopsis orchids, most of their roots will be above the pot and will commonly sprawl outside the container and even along the shelf surface. This is perfectly normal — do not cut them off. These silvery-green aerial roots absorb moisture from the air and are a sign of a healthy, vigorous orchid. Tucking them back into the pot or cutting them off removes healthy functional roots and stresses the plant.

Temperature and Humidity

Temperature

University of Maryland Extension notes that Phalaenopsis orchids do well under normal room temperatures — the 65 to 80°F range that most American homes maintain is essentially ideal for active growth. The important exception: a cool period in fall is the key to triggering new flower spikes. UMD recommends allowing plants to experience cooler night temperatures in fall before bringing them indoors, or positioning them near a slightly cooler window in the home during September and October.

• Summer: 70 to 85°F day; 60 to 70°F night — ideal growing conditions
• Fall (for reblooming): night temperatures of 55 to 65°F for 4 to 6 weeks triggers flower spike initiation in most Phalaenopsis varieties
• Winter: keep consistently above 60°F — cold drafts from windows or air conditioning can cause bud blast (buds aborting before opening)

Humidity

Penn State Extension notes that Phalaenopsis orchids prefer high humidity but usually tolerate the humidity of the home — an important reassurance for orchid beginners who worry about achieving tropical humidity levels. Most homes run at 40 to 50% relative humidity, which is acceptable for Phals. For optimal growth:

• Group orchids with other houseplants — the collective transpiration raises local humidity modestly
• Place pots on trays filled with pebbles and water — with the pot resting above the waterline, evaporating water raises humidity around the foliage
• A small humidifier near the orchid collection is the most reliable solution for serious growers
• University of Maryland Extension notes that low humidity and too little water will result in wrinkled leaves — the most visible sign of humidity or moisture deficiency in Phals

Potting Medium and Repotting

Orchid Potting Medium

According to University of Maryland Extension’s potting guide, epiphytes such as orchids don’t grow in the ground — in nature their roots attach to tree branches, and if they are grown in regular potting mix, their roots may rot. UMD specifies that orchids should be grown in a mix of very porous, lumpy material that does not retain water very long — a common mix is one part peat moss, six parts fir bark, and one part medium-grade charcoal.

Commercial orchid bark mixes (sold specifically as “orchid mix” or “orchid bark”) are widely available and appropriate for Phalaenopsis. Key characteristics of a good orchid medium:

• Chunky, open texture with large air spaces between particles
• Drains almost immediately when watered
• Does not compact or become dense over time
• Fir bark is the standard ingredient; coconut husk chips, perlite, and charcoal are common additions

When and How to Repot

University of Maryland Extension identifies the best time to repot as when new growth has started — not necessarily after the plant has finished blooming. Signs that repotting is needed:

• Bark has broken down into dense, soggy material that stays wet between waterings
• Roots have become so congested the pot is being pushed off its saucer
• Salt deposits are visible on the bark surface
• Plant has not flowered despite adequate light (roots may be stressed)

Repotting process (per UMD Extension):

• Select commercial orchid bark mix and a container with excellent drainage
• Gently knock the plant out of its old pot — if roots have attached to the pot or old bark, soak the plant long enough that they can be gently pried off without breakage
• Cut off any dead, discolored, or damaged roots — healthy roots are firm and white to pale green; dead roots are brown, soft, or hollow
• Rinse away old degraded bark from the plant
• Suspend the plant over the new pot and fill in around the bottom roots with new bark until the plant sits on top — the crown (where leaves meet) should be at or just above the bark surface
• Water the newly repotted plant to settle new bark around the roots
• Expect the plant to rest for 4 to 8 weeks after repotting before resuming active growth

Fertilizing Orchids

University of Maryland Extension notes that Phalaenopsis orchids benefit from light fertilization — but that overfeeding will result in lush growth at the expense of flowers. As a general rule, UMD recommends fertilizing actively growing and flowering plants every third or fourth watering with a commercial orchid fertilizer according to label directions, and skipping fertilization during cooler temperatures and lower light intensity in the winter months.

• Use fertilizer specifically formulated for orchids — these are balanced or slightly phosphorus-heavy (to encourage flowering) and contain the micronutrients orchids need
• Apply at quarter to half the recommended concentration — “weakly, weekly” is the classic orchid fertilizing rule
• Flush the bark with clear water every 4 to 6 weeks to prevent salt accumulation from fertilizers — this is particularly important because orchid bark has less buffering capacity than soil
• Stop or significantly reduce fertilizing from October through February when growth naturally slows

Getting Orchids to Rebloom

The most common orchid disappointment: a beautiful blooming plant purchased from a store that flowers magnificently for 2 to 3 months, then never blooms again. The solution almost always involves one or more of these three factors:

• Increase light: University of Maryland Extension names low light as the most common cause for not re-flowering. Move the plant to a brighter east or south window — or put it outdoors in a shady location during summer months. Even several feet closer to a window makes a meaningful difference.
• Provide a cool period: University of Maryland Extension identifies this as a reliable trigger for flower spike initiation: allowing plants to experience cooler night temperatures (55 to 65°F) in fall before bringing them back indoors. This temperature differential between day and night replicates the natural seasonal signal that triggers flowering in tropical forests.
• After a bloom spike finishes: do not cut the spent spike all the way to the base immediately. Leave it in place and watch for a new bud that may develop from a node below the original flower cluster — many Phalaenopsis will produce a secondary bloom from the existing spike. Only cut to the base once the spike has turned completely brown and dried.

Common Orchid Problems

• Yellowing leaves: the most common orchid complaint. Causes include overwatering (check root health — remove from pot and examine), too much direct sun (bleaches to yellow), natural leaf aging (bottom leaves periodically yellow and drop — normal), or root rot (mushy, hollow roots).
• Wrinkled, limp leaves: dehydration — either underwatering, low humidity, or root rot preventing water uptake. Check roots before watering more aggressively.
• Bud blast (buds dropping before opening): cold drafts, sudden temperature fluctuations, ethylene gas exposure (from nearby fruit), or low humidity. Keep orchids away from cold windows in winter, air conditioning vents, and fruit bowls.
• No flower spikes despite good foliage: insufficient light or absence of a cool fall period. Try the cool-period trigger described above.
• Root rot: mushy, hollow, brown roots from chronic overwatering. Remove from pot, trim all dead roots, allow to dry for 24 hours, repot in fresh bark. Adjust watering to allow bark to dry more completely between waterings.
• Mealybugs or scale: white cottony masses or flat brown discs on leaves and stems. Wipe with rubbing alcohol on a cotton swab; isolate immediately; treat weekly until clear.

Quick-Reference Orchid Care Guide

• Best location: east or west window — bright indirect light, no direct afternoon sun
• Water when bark is almost dry — every 7 to 14 days; never let sit in water
• Aerial roots are healthy — never cut them off or tuck them into the bark
• Orchid bark mix only — never regular potting soil
• Fertilize lightly — quarter-strength orchid fertilizer every 3 to 4 waterings
• Cool nights in fall (55 to 65°F) trigger new flower spikes
• Repot when bark breaks down — every 1 to 3 years typically
• Toxic to pets: Phalaenopsis is considered non-toxic, but verify any variety before placing near animals

Caring for orchids successfully dispels the myth that they are difficult houseplants and reveals one of the most rewarding relationships available in indoor gardening — plants that bloom for months at a stretch, produce architectural flower spikes of extraordinary elegance, and reward consistent basic care with reliable annual reblooming for years and decades. The learning curve is genuinely gentle: master the watering rhythm, provide adequate light, and give the plant a cool fall period, and the rest follows naturally.

Start with a Phalaenopsis from a grocery store or big-box garden center — the most accessible and most forgiving entry point into orchid growing. Learn its rhythms through one full year. And discover, as millions of orchid enthusiasts have before you, why these extraordinary plants inspire such devoted and lasting affection from the gardeners who grow them.

Share your orchid reblooming successes and photos in the comments! And for more on building a complete indoor plant collection, see our pothos care guide and our best indoor plants guide.

👉 Read Next: Best Indoor Plants for Beginners — Easy Houseplants That Always Thrive

Maria

Maria Walker is a certified horticulturist and gardening specialist with over 15 years of hands-on experience in plant care, garden design, and sustainable growing practices.
She holds a Bachelor’s degree in Horticulture Science and a Master’s degree in Sustainable Agriculture — and has spent her career helping people of all skill levels create beautiful, thriving gardens.
Maria launched Outz News Garden with one simple mission: to make gardening accessible and inspiring for everyone, from first-time planters to seasoned green thumbs.