Gu-sui-bu
Drynaria Roosii
Drynaria Roosii, commonly known as Gu-sui-bu, is a unique fern native to tropical regions. Its lush, green fronds make it a popular choice for indoor gardens, thriving in high humidity and indirect light.
Everything it needs
9 essentials at a glance
Watering
Drynaria Roosii prefers consistently moist soil but should not be waterlogged.
Water every 1-2 weeks, allowing the top inch of soil to dry out between waterings. In the growing season (spring and summer), increase frequency if the soil dries out quickly. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf curling and browning.
Light
This plant thrives in bright, indirect light but can tolerate partial shade.
Ideally, it should receive 4-6 hours of filtered sunlight daily. Avoid direct sunlight as it can scorch the leaves. A location near a north or east-facing window is often ideal.
Soil
Drynaria Roosii prefers a well-draining potting mix with a pH range of 5.5 to 6.5.
A blend of peat, perlite, and orchid bark is recommended to ensure adequate drainage and aeration. Avoid heavy soils that retain too much moisture.
Humidity
This fern enjoys high humidity levels, ideally between 60-80%.
To increase humidity, consider using a pebble tray with water or a humidifier. Signs of low humidity include browning leaf tips and edges, while excessive humidity can lead to mold growth.
Temperature
Drynaria Roosii thrives in temperatures between 65-80°F (18-27°C).
It is not frost-tolerant and should be kept above 50°F (10°C). Ideal hardiness zones are 10-11, making it suitable for warm climates.
Fertilizing
Use a balanced, water-soluble fertilizer with an NPK ratio of 20-20-20 during the growing season, every 4-6 weeks.
Reduce feeding in the fall and winter months. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune dead or damaged fronds as needed to encourage new growth.
Use clean, sharp scissors or pruning shears to avoid disease. Deadheading is not necessary as this plant does not produce flowers.
Repotting
Repot every 1-2 years or when the plant becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. When repotting, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be done through division or spores.
For division, carefully separate the rhizomes during repotting in spring, ensuring each division has roots and foliage. For spores, collect them from mature fronds and sow them on a suitable medium, keeping them moist until germination.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or insufficient light.
How to fix it
Adjust watering schedule and ensure the plant receives adequate indirect sunlight.
Browning leaf tips
Why it happens
Typically a sign of low humidity or under-watering.
How to fix it
Increase humidity levels and ensure consistent watering.
Root rot
Why it happens
Caused by overly wet soil and poor drainage.
How to fix it
Allow the soil to dry out, improve drainage, and consider repotting into fresh soil.
Stunted growth
Why it happens
Can result from nutrient deficiency or being root-bound.
How to fix it
Fertilize appropriately and repot if necessary.
Pests (e.g., spider mites, aphids)
Why it happens
Pests thrive in dry conditions and can attack stressed plants.
How to fix it
Increase humidity, regularly inspect for pests, and treat with insecticidal soap if necessary.
Care through the year
Spring
In spring, increase watering frequency as the plant begins to actively grow. Fertilize every 4-6 weeks with a balanced fertilizer.
Summer
During summer, ensure the plant receives adequate humidity and water more frequently if the soil dries out quickly. Monitor for pests.
Fall
In fall, gradually reduce watering and stop fertilizing as the plant enters dormancy. Maintain humidity levels.
Winter
In winter, keep the plant in a warm location and reduce watering. Ensure it does not experience drafts or extreme temperature fluctuations.
Toxicity & Safety
Drynaria Roosii is non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. It is always best to keep plants out of reach of curious pets and children.
Good to know
Why are my Drynaria Roosii leaves turning yellow?
Yellow leaves on your Drynaria Roosii may indicate over-watering or insufficient light. Ensure you are watering correctly and providing adequate indirect sunlight.
How often should I water my Drynaria Roosii?
Water your Drynaria Roosii every 1-2 weeks, allowing the top inch of soil to dry out between waterings. Adjust frequency based on environmental conditions.
What humidity level does Drynaria Roosii prefer?
Drynaria Roosii thrives in humidity levels between 60-80%. You can increase humidity by using a pebble tray or a humidifier.
When is the best time to repot Drynaria Roosii?
The best time to repot Drynaria Roosii is every 1-2 years in spring when it is actively growing. Look for signs of being root-bound before repotting.
How can I propagate Drynaria Roosii?
You can propagate Drynaria Roosii through division or spores. Division is best done in spring, ensuring each section has roots and foliage.
What type of soil is best for Drynaria Roosii?
Drynaria Roosii prefers a well-draining potting mix with a pH of 5.5 to 6.5. A mix of peat, perlite, and orchid bark works well.
Is Drynaria Roosii toxic to pets?
No, Drynaria Roosii is non-toxic to both pets and children, making it a safe choice for households with animals.
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