Goldfish Plant

Nematanthus spp., Guppy Plant

The Goldfish Plant is a trailing, tropical perennial vine native to Central and South America. It is closely related to the African Violet and the Lipstick Plant (all belonging to the Gesneriaceae family). It is primarily grown for its unique flowers, which are bright orange or red and have a distinct puffy shape that strongly resembles a leaping goldfish. It features small, thick, dark green, waxy, sometimes glossy leaves on long, cascading stems, making it ideal for hanging baskets. Popular cultivated varieties include Nematanthus wettsteinii and various Columnea hybrids.

Care Guide

LIGHT

  • Requires bright, indirect light to encourage abundant blooming.
  • An East or West-facing window is ideal.
  • A few hours of direct morning sun can be tolerated and is beneficial for flower production.
  • Insufficient light leads to leggy growth and sparse or absent flowers.

WATER

  • Prefers to be kept evenly moist during the spring and summer growing season.
  • Allow the top inch of soil to dry out between waterings.
  • Never let the soil become waterlogged or soggy, as it is prone to root rot.
  • Reduce watering significantly in the fall and winter when the plant is resting.

SOIL

  • Needs a light, airy, and very well-draining potting mix.
  • A blend of standard potting soil with generous amounts of perlite, coco coir, or fine orchid bark works well, mimicking its epiphytic nature.

GROWTH HABIT

  • Ideal conditions: High humidity (50%+), warm temperatures (65-75F), and bright, indirect light.
  • Growth rate & size: Growth rate is moderate to fast as a trailing vine, easily reaching 2-3 feet in length in a hanging basket.

PROPAGATING

  • Propagates easily from stem tip cuttings taken in spring or summer.
  • Take cuttings with several nodes, remove the lower leaves, and root in water, moist sphagnum moss, or a light potting mix.
  • Place the cuttings in a warm, humid spot to encourage faster rooting.

PRUNING

  • Pruning is essential to keep the plant bushy and compact.
  • Pinch or cut back the long, trailing stems regularly, especially after a bloom cycle, to encourage new growth and more flowers.
  • Remove old, spent flowers and yellowed or damaged leaves.

REPOTTING

  • Repot when the plant is root-bound, typically every 2-3 years.
  • Repot in the spring or early summer.
  • It performs well when slightly pot-bound, so choose a pot only slightly larger than the previous one.

FERTILIZING

  • Feed regularly during the spring and summer growing season (every 2-4 weeks).
  • Use a balanced liquid houseplant fertilizer diluted to half strength.
  • A fertilizer higher in phosphorus (middle number) can be used to encourage blooming.

FLOWERING

  • Produces distinctive bright orange, tubular, puffy flowers that resemble small fish.
  • Flowers are produced continuously under ideal conditions (consistent warmth, light, and feeding).
  • Cooler night temperatures in winter (around 60F) can help stimulate a heavy spring bloom.

TOXICITY

  • Goldfish Plants are generally considered non-toxic to humans and pets.

PRO TIPS

  • High humidity is the key to preventing bud blast (flower buds shriveling and dropping).
  • If the plant is not blooming, it almost always needs more light or a pruning to encourage new growth.
  • They benefit from being grown in hanging baskets to display the trailing stems and flowers.

Variants in Care

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

Thick-Leaved Varieties

Examples: Nematanthus wettsteinii

  • Have thicker, waxier leaves that are slightly more tolerant of dry air and short periods of drying out between waterings.
  • Often exhibit a shorter, more compact trailing habit.

Fine-Leaved/Delicate Varieties

Examples: Columnea gloriosa hybrids

  • Have smaller, sometimes fuzzy leaves and a more delicate trailing form.
  • Require higher, more consistent humidity and are more sensitive to cold drafts.
  • Need very attentive watering to prevent wilting.

Patterned Foliage Varieties

Examples: Those with darker stripes or patterns on the underside of the leaf.

  • The patterns are maintained best under bright, consistent indirect light.
  • These types are sometimes slower-growing than the standard green cultivars.

Bloom Information

Post-Bloom Care and Pruning

Pruning after a flowering cycle prevents the plant from becoming leggy and encourages the growth of new stems where future flowers will form.

  • Once the "goldfish" shaped blooms have faded and fallen, trim the stems back by about one-third to maintain a bushy, compact shape.
  • Pinch off the tips of new stems regularly to promote branching; more branches result in a higher density of flowering sites.
  • Remove any thin or leafless "stringy" stems to ensure the plant directs its energy toward healthy, productive growth.

Primary Reblooming Triggers

Light Intensity and Consistency

  • Goldfish plants require very bright, indirect light to produce flowers. If the light is too low, the plant will grow leggy and fail to set buds.
  • A north or east-facing window is ideal; if using a south or west window, ensure the plant is protected from direct midday sun which can scorch the waxy leaves.
  • Consistent light for 12 to 14 hours a day is often necessary to trigger a heavy bloom.

Temperature and Humidity

  • Maintain stable temperatures between 65–75°F. These plants are sensitive to cold drafts and sudden temperature changes, which can cause "bud drop."
  • As epiphytes in their natural habitat, they require moderate to high humidity. Low humidity can prevent flowers from forming or cause them to shrivel prematurely.

Variants in Care: Blooming Specifics

Columnea gloriosa (Hardy Goldfish)

  • This variant features smaller, reddish-orange flowers and is more sensitive to over-watering during the bud-setting phase.
  • It requires a slightly drier period in the winter to trigger its spring blooming cycle.

Nematanthus gregarius (Clog Plant)

  • This variant has darker, more succulent-like leaves and produces the classic bright orange "pouch" flowers.
  • It is more tolerant of slightly lower humidity but requires higher light intensity than the Columnea types to bloom consistently.

Nutritional and Maintenance Needs

  • Use a high-phosphorus fertilizer (often labeled as a "bloom booster") every two weeks during the active growing season from spring through autumn.
  • Dilute the fertilizer to half-strength to avoid damaging the fine root system.
  • Water thoroughly when the top inch of soil feels dry, but never allow the plant to sit in water, as they are highly susceptible to root rot.
  • These plants prefer to be slightly root-bound; keeping them in a smaller pot can help trigger the plant to produce flowers rather than just more foliage.

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