Orchid

Phalaenopsis, Cattleya, Oncidium, Dendrobium, Moth Orchid, Boat Orchid, Lady Slipper

Orchids are one of the largest and most diverse families of flowering plants, native to tropical and subtropical regions. They are typically epiphytes (growing on trees) or lithophytes (growing on rocks) and are prized for their complex, showy, and long-lasting flowers. The care varies dramatically by genus, but the common Moth Orchid (Phalaenopsis) is the most popular houseplant and guides the general advice. They feature thick, fleshy roots used for anchoring and nutrient absorption.

Care Guide

LIGHT

  • Light needs depend entirely on the genus.
  • Phalaenopsis (Moth Orchids) prefer medium to bright, indirect light. A North or East window is ideal; too much sun will burn the leaves.
  • Cattleyas require high, bright light (West or South window) to flower.
  • Leaf color indicates light: Medium green is good; dark green is too little light; yellow-green/red-tinged is too much light.

WATER

  • Water requirements vary, but the general rule is to water when the potting medium dries out.
  • For Phalaenopsis, water when the roots turn silvery-grey (usually every 7-10 days).
  • Soak the entire pot for 15-20 minutes, then drain completely. Never let the roots sit in water.
  • Use distilled, filtered, or rainwater as they are sensitive to mineral salts.

SOIL

  • NEVER use standard soil. Needs a chunky, porous, and sterile medium that provides excellent air flow.
  • A blend of orchid bark, sphagnum moss, charcoal, and perlite is common.
  • The medium breaks down over time, requiring periodic replacement.

GROWTH HABIT

  • Ideal conditions: High humidity (50-70%), consistent warmth (65-80F), and excellent air circulation.
  • Growth rate & size: Growth rate is slow to moderate. Most indoor types remain small to medium-sized.

PROPAGATING

  • Propagated by division of the rhizome (for clumping types) or by rooting Keikis (small plantlets that sometimes grow on the flower stalk of Phalaenopsis).
  • Keikis are removed only when they have at least two small roots and a few leaves.

PRUNING

  • Prune by removing spent flower stalks once the blooms fade.
  • For Phalaenopsis, the stalk can be cut just above the second node from the base to encourage reblooming, or cut completely down for new stalk growth.
  • Remove old, yellowed, or damaged leaves at the base.

REPOTTING

  • Repot annually or bi-annually, not because the plant is root-bound, but because the medium has broken down (turns mushy, retains water).
  • Repot after the plant has finished blooming, usually in the spring.
  • Cut away all dead, mushy roots before repotting into fresh medium.

FERTILIZING

  • Feed lightly and consistently, using the motto: "Weakly, weekly."
  • Use a liquid orchid fertilizer diluted to quarter strength, applied with every watering during the growing season.
  • Reduce feeding in the winter.

FLOWERING

  • Flowers are the main feature, often lasting for weeks or months.
  • Reblooming is triggered by consistent care, high light, and often a slight temperature drop (10-15 degrees) at night for 4-6 weeks in the fall/winter.

TOXICITY

  • Most common houseplant Orchids (e.g., Phalaenopsis) are generally considered non-toxic to humans and pets.

PRO TIPS

  • Air circulation is as important as humidity to prevent fungal disease (e.g., rot).
  • Brown root tips often indicate salt or mineral burn from tap water or fertilizer; use pure water.
  • Staking may be needed to support heavy bloom spikes.

Variants in Care

Most varieties of this plant follow the standard care above, but some require adjustments.

Phalaenopsis (Moth Orchids)

  • The easiest to rebloom. Require a cool period (60F at night) for bud setting.
  • Best grown in a chunky bark mix or sphagnum moss.

Cattleya/Oncidium

  • Require much higher light than Phalaenopsis to set flowers (leaves should be lime-green, not dark green).
  • Often have a pseudobulb (water storage organ) and must be allowed to dry out more completely between waterings.

Terrestrial Orchids

Examples: Paphiopedilum (Lady Slipper), Cymbidium

  • Lady Slippers are the only type that requires the medium to stay consistently moist and often thrive in a finer medium mix.
  • Cymbidiums can be tolerant of slightly cooler temperatures and need a soil-based medium (unlike epiphytes).

Bloom Information

Post-Bloom Care and Pruning

Once the flowers have faded, you must decide how to prune the flower spike based on its condition and the plant's energy needs.

If the flower stalk is still green and healthy

  • Cut the stalk about half an inch above a node (the small bumps on the stem). This can encourage a secondary spike to grow from that node, although the subsequent flowers may be smaller.
  • Alternatively, cut the stalk all the way to the base. This is often recommended for long-term health as it allows the orchid to redirect all its energy into developing new leaves and roots rather than maintaining an old spike.
  • Use only sterilized scissors or pruners to avoid introducing bacteria. A clean cut prevents crushing the tissue.

If the stalk turns yellow, brown, or dry

  • Cut the stalk back to the base of the plant immediately. A brown stalk is dead tissue and will not produce more flowers.
  • Removing dead stalks helps the orchid focus on its next growth cycle.

Primary Reblooming Triggers

Orchids generally require a specific change in their environment to signal that it is time to produce a new flower spike.

Temperature Fluctuations

  • Provide a temperature drop of 10–15 degrees between day and night for approximately four weeks.
  • For most common orchids, daytime temperatures should be between 70–80°F, while night temperatures should drop to 60–65°F.
  • This temperature shift is the most common trigger for Phalaenopsis orchids to begin spiking.

Light Quality and Intensity

  • Place the orchid in bright, indirect light, such as an east-facing window.
  • Observe leaf color to gauge light levels. A medium, grassy green indicates healthy light levels. Dark forest green suggests the plant needs more light, while a reddish tint suggests too much direct sun.
  • Without sufficient light, the plant will continue to grow leaves but will lack the energy to produce flowers.

Variants in Care by Orchid Type

Different orchid genera have unique biological requirements for their dormant and blooming phases.

Phalaenopsis (Moth Orchid)

  • These typically bloom once a year, often from late winter through spring.
  • They are the most sensitive to the autumn temperature drop mentioned above.

Dendrobium

  • Many Nobile-type Dendrobiums require a winter rest period to bloom.
  • This involves significantly reducing water and stopping all fertilizer during the winter months while keeping the plant in a cool, bright location.
  • Failure to provide this dry rest often results in the plant growing baby plants instead of flower buds.

Cattleya

  • These require higher light levels than most other common orchids to trigger blooming.
  • They often produce a green sheath at the top of a new leaf from which the flowers will eventually emerge.
  • Ensure they have high humidity and consistent feeding during the growth of new pseudobulbs.

Oncidium

  • These orchids usually bloom once their new pseudobulbs have reached full maturity.
  • They prefer more consistent moisture than Phalaenopsis and should not be allowed to dry out completely while the bloom spike is developing.

Nutritional and Long-Term Maintenance

  • Feed the plant with a balanced orchid fertilizer, such as a 20-20-20 formula, at one-quarter to one-half the recommended strength.
  • Fertilize every two to four weeks during the growth phase, but flush the potting medium with plain water once a month to prevent mineral salts from building up and burning the roots.
  • Avoid repotting while the orchid is in its rest period or starting to spike. Orchids bloom best when their roots are somewhat snug in the pot.
  • Repot only every two years or if the potting bark has begun to decompose and turn into a soil-like consistency.

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