Aglaonema costatum
Aglaonema costatum
Aglaonema costatum, commonly known as Chinese Evergreen, is a stunning houseplant valued for its attractive foliage and adaptability. Native to tropical regions, it thrives in low light and high humidity, making it a popular choice for indoor spaces.
Everything it needs
9 essentials at a glance
Watering
Aglaonema costatum prefers consistently moist soil but does not tolerate soggy conditions.
Water when the top 1-2 inches of soil feel dry, typically every 7-10 days. In winter, reduce watering frequency to every 2-3 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf curling and browning at the tips.
Light
This plant thrives in low to medium indirect light but can tolerate brighter conditions.
Ideal placement is near a north or east-facing window, receiving 6-8 hours of filtered light daily. Avoid direct sunlight, which can scorch the leaves, and ensure it has some shade during the hottest part of the day.
Soil
Aglaonema costatum prefers a well-draining potting mix rich in organic matter.
A pH range of 6.0 to 6.5 is ideal. A recommended potting mix can include peat, perlite, and pine bark to ensure good drainage and aeration.
Humidity
This plant enjoys high humidity levels between 50-70%.
To increase humidity, consider using a humidifier or placing a tray of water with pebbles near the plant. Signs of humidity stress include leaf browning and curling, particularly at the edges.
Temperature
Aglaonema costatum thrives in temperatures between 65-80°F (18-27°C) and is hardy in zones 10-12.
It can tolerate brief periods of lower temperatures but should be protected from frost and extreme heat, which can cause stress and damage.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 20-20-20 every 4-6 weeks during the growing season (spring and summer).
In fall and winter, reduce feeding to once every 2-3 months. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Aglaonema costatum as needed to remove any dead or yellowing leaves, which can be done year-round.
Use clean, sharp scissors or pruning shears to avoid damaging the plant. Deadheading is not necessary, but maintaining its shape can enhance its appearance.
Repotting
Repot when the plant becomes root-bound, typically every 1-2 years.
Choose a pot 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through division or stem cuttings.
For division, carefully separate the plant into sections with roots during repotting, ideally in spring. For stem cuttings, take a 4-6 inch cutting with a few leaves, place it in water or moist soil, and keep it warm until roots develop, typically within 4-6 weeks.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or insufficient light can cause yellowing leaves.
How to fix it
Ensure proper watering by allowing the top soil to dry out before watering again, and move the plant to a brighter location if needed.
Brown leaf tips
Why it happens
Low humidity or underwatering can lead to browning at the leaf tips.
How to fix it
Increase humidity levels around the plant and adjust the watering schedule to keep the soil consistently moist.
Leaf drop
Why it happens
Sudden temperature changes or stress from repotting can cause leaves to drop.
How to fix it
Maintain stable temperatures and minimize disturbances during the repotting process to reduce stress.
Root rot
Why it happens
Over-watering and poor drainage can lead to root rot.
How to fix it
Allow the soil to dry out between waterings and ensure the pot has adequate drainage holes.
Pests (e.g., spider mites, aphids)
Why it happens
Pests can infest the plant, particularly in dry conditions.
How to fix it
Regularly inspect the plant and treat infestations with insecticidal soap or neem oil.
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 to promote healthy growth.
Summer
During summer, ensure the plant receives adequate humidity and light. Monitor for pests and increase watering as needed to keep the soil moist.
Fall
In fall, gradually reduce watering as the plant's growth slows. Continue fertilizing until late fall, then switch to a less frequent schedule.
Winter
In winter, reduce watering to every 2-3 weeks and keep the plant in a warm area away from drafts. Maintain humidity levels to prevent leaf stress.
Toxicity & Safety
Aglaonema costatum is toxic to pets and humans if ingested. The plant contains calcium oxalate crystals, which can cause irritation, swelling, and digestive upset if eaten. Keep it out of reach of children and pets.
Good to know
Why are my Aglaonema costatum leaves turning yellow?
Yellow leaves on Aglaonema costatum can indicate over-watering or insufficient light. Check the soil moisture and consider moving the plant to a brighter location.
How often should I water my Aglaonema costatum?
Water your Aglaonema costatum when the top 1-2 inches of soil feel dry, typically every 7-10 days, but reduce frequency in winter.
What humidity level is best for Aglaonema costatum?
Aglaonema costatum prefers humidity levels between 50-70%. Increasing humidity can help prevent leaf browning and curling.
How do I propagate Aglaonema costatum?
You can propagate Aglaonema costatum through division or stem cuttings. Division is best done during repotting in spring, while stem cuttings can root in water or soil.
What type of soil is best for Aglaonema costatum?
A well-draining potting mix rich in organic matter is ideal for Aglaonema costatum. A pH range of 6.0 to 6.5 is recommended.
When should I repot my Aglaonema costatum?
Repot your Aglaonema costatum every 1-2 years or when you notice roots growing out of the drainage holes, indicating it is root-bound.
Is Aglaonema costatum toxic to pets?
Yes, Aglaonema costatum is toxic to pets and humans if ingested, causing irritation and digestive upset. Keep it out of reach of children and pets.
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