Nematanthus gregarius
Nematanthus gregarius
Nematanthus gregarius, commonly known as the goldfish plant, is cherished for its unique, tubular flowers resembling goldfish. Native to tropical regions, this plant adds vibrant color and charm to indoor spaces, making it a popular choice among houseplant enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Nematanthus gregarius prefers to be kept moderately moist.
Water when the top inch of soil feels dry, typically every 1-2 weeks. In the growing season (spring and summer), increase frequency as needed, while in fall and winter, reduce watering to avoid root rot. Signs of over-watering include yellowing leaves and mushy stems, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in bright, indirect light but can tolerate partial shade.
Ideally, it should receive about 6-8 hours of filtered light daily. Avoid direct sunlight, which can scorch the leaves. A north or east-facing window is often the best placement.
Soil
Nematanthus gregarius prefers a well-draining potting mix, ideally with a pH range of 6.0 to 7.0.
A mix of peat moss, perlite, and orchid bark works well to ensure good drainage while retaining some moisture. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
This plant enjoys higher humidity levels, ideally between 50-70%.
To increase humidity, consider using a pebble tray with water or a humidifier. Signs of low humidity stress include browning leaf tips and edges, while excessive humidity can lead to mold growth.
Temperature
Nematanthus gregarius thrives in temperatures between 65-80°F (18-27°C).
It is not frost-tolerant and should be protected from temperatures below 50°F (10°C). It is best suited for USDA hardiness zones 10-12.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 20-20-20 every 4-6 weeks during the growing season.
Reduce feeding in fall and winter when the plant is dormant. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Prune Nematanthus gregarius in early spring to maintain its shape and encourage bushier growth.
Use clean, sharp scissors or pruning shears to remove dead or leggy stems. Deadheading spent flowers can also promote more blooms.
Repotting
Repot every 1-2 years or when the plant becomes root-bound, indicated by roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix. Water thoroughly after repotting.
Propagation
Propagation can be done through stem cuttings.
Take 4-6 inch cuttings from healthy stems, remove the lower leaves, and place them in a pot with moist potting mix. Cover with a plastic bag to maintain humidity and place in bright, indirect light. Roots should develop in 4-6 weeks. The best time to propagate is in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency.
How to fix it
Check soil moisture and adjust watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Under-watering or low humidity.
How to fix it
Increase watering frequency and consider raising humidity levels around the plant.
Browning leaf tips
Why it happens
Low humidity or over-fertilization.
How to fix it
Increase humidity levels and reduce fertilizer application to avoid salt buildup.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a brighter location with indirect light to encourage denser growth.
Root rot
Why it happens
Poor drainage or over-watering.
How to fix it
Ensure the pot has drainage holes, reduce watering frequency, and consider repotting in fresh, well-draining soil.
Care through the year
Spring
In spring, increase watering as the plant begins to grow actively. Fertilize every 4-6 weeks to support new growth and consider repotting if necessary.
Summer
During summer, maintain consistent moisture and ensure the plant receives bright, indirect light. Monitor humidity levels and adjust watering as needed.
Fall
In fall, gradually reduce watering as the plant enters dormancy. Continue to fertilize until late fall, then stop for the winter months.
Winter
In winter, keep the plant in a warm location away from drafts. Water less frequently, allowing the soil to dry out more between waterings.
Toxicity & Safety
Nematanthus gregarius is considered non-toxic to pets (cats and dogs) and children. However, ingestion of any plant material can cause mild gastrointestinal upset, so it is best to keep it out of reach.
Good to know
Why are my Nematanthus gregarius leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check the soil moisture and adjust your watering schedule accordingly.
How often should I water my Nematanthus gregarius?
Water your Nematanthus gregarius when the top inch of soil feels dry, typically every 1-2 weeks, adjusting for seasonal changes.
What light conditions are best for Nematanthus gregarius?
This plant thrives in bright, indirect light, ideally receiving 6-8 hours of filtered light daily. Avoid direct sunlight to prevent leaf scorch.
How can I increase humidity for my Nematanthus gregarius?
To increase humidity, use a pebble tray with water or a humidifier, aiming for levels between 50-70% to keep your plant healthy.
When is the best time to propagate Nematanthus gregarius?
The best time to propagate is in spring or early summer when the plant is actively growing. Use healthy stem cuttings for best results.
How do I know when to repot my Nematanthus gregarius?
Repot when the plant becomes root-bound, indicated by roots growing out of the drainage holes, typically every 1-2 years.
Is Nematanthus gregarius safe for pets?
Yes, Nematanthus gregarius is non-toxic to pets and children, making it a safe choice for households with animals.
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