The goldfish plant (Nematanthus, sometimes still sold as Columnea or Hypocyrta) is a trailing Gesneriad grown for its small, waxy orange flowers, which really do look like tiny leaping goldfish tucked among the foliage. It’s a cousin of the African violet, and that family resemblance shows up in its care: it wants steady warmth, good light, and roots that are moist but never soggy. Give it those, and a mature plant can flower on and off for most of the year.

Light

Bright, indirect light is essential, and unlike a lot of trailing houseplants, the goldfish plant actually benefits from an hour or two of gentle direct sun, especially in the morning. An east-facing window is close to ideal; a spot a few feet back from a south or west window also works. Too little light is the most common reason a goldfish plant grows but never blooms — the foliage stays glossy and healthy while the flowers simply don’t show up. For more on judging whether a spot is bright enough, see how much light do houseplants actually need.

Watering

Water when the top inch or two of soil has dried out, then soak thoroughly and let the pot drain completely. The thick, waxy leaves store some water, so the plant tolerates a bit of neglect between waterings better than it tolerates sitting wet — constantly damp soil leads to root rot and dropped leaves fairly quickly. Cut back further in winter, when growth slows down. If you’re unsure how to judge soil moisture by feel rather than a fixed schedule, watering houseplants the right way covers the basics.

Soil and pot

Use a light, well-draining mix — a standard houseplant potting soil cut with extra perlite works well, similar to what you’d use for an African violet. Heavy, water-retentive soil around the roots is the fastest way to invite rot in this plant. Whatever mix you choose, the pot needs a drainage hole, and a hanging basket or pot on a shelf suits the trailing growth habit better than a spot where the vines have nowhere to fall. If you’re building out a collection of trailing plants, this one pairs well with others in best hanging and trailing houseplants.

Humidity

Goldfish plants come from humid tropical forests and appreciate humidity above average room levels, ideally 50% or higher. In dry air the leaf tips can crisp up and flower buds are more likely to drop before opening. A pebble tray, a nearby humidifier, or grouping it with other plants all help; misting the foliage directly is best avoided since water sitting on the leaves can encourage spotting. See how to increase humidity for houseplants for humidity-boosting methods that don’t involve wetting the leaves.

Getting it to bloom

Flowers are the whole point of growing this plant, and getting a good flush takes a bit more than routine care. Bright light is the biggest factor — a goldfish plant kept in medium or low light will grow but rarely flower. The second factor is a short rest period: after a bloom cycle, or over the cooler, darker months, let the plant run slightly drier and cooler (down to around 60°F) for several weeks. That mild stress signals the plant to set new flower buds, and resuming normal warmth, light, and watering afterward often triggers a fresh round of blooms. Feeding with a diluted balanced fertilizer during the growing season also helps fuel flowering, but light and that dry rest matter more than any fertilizer schedule.

Toxicity

Goldfish plants are considered non-toxic to cats and dogs, which makes them a reasonable choice for households with curious pets. For more options, see pet-safe houseplants for cats and dogs — though it’s still worth keeping any trailing vine out of easy reach of pets that like to chew on foliage.

Common problems

No flowers despite healthy growth almost always comes down to insufficient light or skipping the cooler, drier rest period described above. Move the plant somewhere brighter before trying anything else.

Dropped flower buds usually mean a sudden change in conditions — low humidity, a cold draft, or the soil drying out too far right as buds are forming. Keep conditions as steady as you can while buds are developing.

Mushy stems or yellowing leaves point to overwatering or poor drainage. Let the soil dry out further between waterings and check that the pot actually drains; see how to identify and fix root rot if it’s progressed past yellowing.

Leggy, sparse vines with long gaps between leaves are a light issue, the same as with most trailing houseplants — move it somewhere brighter and pinch back the vines to encourage bushier new growth.

Crispy leaf edges are typically a humidity problem, especially in winter with heating running. Raise the humidity around the plant rather than watering more often.