Shield Aralia
Polyscias scutellariaUSDA | Grow Zone
10-12Outdoors all year in zones 10 to 12. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Bright, indirect
- Water
- When top inch is dry
- Humidity
- 50-70%
- Temperature
- 65-80°F (18-27°C)
- Difficulty
- Intermediate
- Growth
- Moderate
- Mature size
- 4-6 ft tall, 2-3 ft wide
- Pets
- Mildly toxic to pets
Shield Aralia, or Polyscias scutellaria, is a striking houseplant known for its lush foliage and unique leaf shape. Native to tropical regions, it adds a touch of exotic beauty to indoor spaces, making it a popular choice among plant enthusiasts.
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Ideal temperature
50-80°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 4-6 ft tall, 2-3 ft wide
- Plant apart
- 12-24 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Shield Aralia prefers to be kept consistently moist but not soggy.
Water when the top inch of soil feels dry, typically every 1-2 weeks. In the winter months, reduce watering frequency as the plant's growth slows. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf drop and wilting.
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. If the plant's growth becomes leggy, it may not be receiving enough light.
Soil
Polyscias scutellaria prefers a well-draining potting mix, ideally a blend of peat, perlite, and pine bark.
The ideal pH range is between 6.0 and 7.0. Ensure the pot has drainage holes to prevent waterlogging, which can lead to root rot.
Humidity
Shield Aralia enjoys higher humidity levels, ideally between 50-70%.
To increase humidity, consider misting the leaves regularly or placing a humidifier nearby. Signs of low humidity include browning leaf tips and leaf drop.
Temperature
This plant thrives in temperatures between 65-80°F (18-27°C) and prefers to stay above 50°F (10°C).
It is best suited for USDA hardiness zones 10-12. Protect from cold drafts and extreme heat, which can stress the plant.
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).
Reduce fertilization in fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Shield Aralia in spring to maintain its shape and encourage bushier growth.
Use clean, sharp pruning shears to remove any dead or damaged leaves, as well as to shape the plant. Deadheading is not necessary, but removing spent leaves can improve appearance.
Repotting
Repot every 2-3 years or when you notice roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include slowed growth and root-bound conditions. When repotting, gently remove the plant from its old pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through stem cuttings or division.
For stem cuttings, take a 4-6 inch cutting from a healthy stem, remove the lower leaves, and place it in water or moist soil. Keep the cutting in a warm, humid environment until roots develop, which usually takes 4-6 weeks. Division can be done during repotting in spring.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or poor drainage.
How to fix it
Allow the soil to dry out slightly before watering again, and ensure the pot has adequate drainage.
Leaf drop
Why it happens
Sudden changes in temperature or humidity.
How to fix it
Maintain stable environmental conditions and avoid placing the plant near drafts or heat sources.
Browning leaf tips
Why it happens
Low humidity levels.
How to fix it
Increase humidity through misting or using a humidifier to maintain a more suitable environment.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a brighter location where it can receive indirect sunlight for several hours a day.
Root rot
Why it happens
Over-watering and poor drainage.
How to fix it
Reduce watering frequency and ensure the pot has good drainage. If root rot occurs, remove affected roots and repot in fresh soil.
Care through the year
Spring
In spring, increase watering as the plant begins to grow actively. Fertilize every 4-6 weeks and consider repotting if needed.
Summer
During summer, ensure the plant receives adequate light and humidity. Water regularly, allowing the top inch of soil to dry out between waterings.
Fall
In fall, gradually reduce watering as the plant's growth slows. Continue fertilizing until late fall, then stop for the winter months.
Winter
In winter, keep the plant in a warm location and reduce watering frequency. Monitor humidity levels to prevent leaf drop.
Toxicity & Safety
Shield Aralia is considered mildly toxic to pets and humans. Ingestion of the leaves can cause gastrointestinal upset, including vomiting and diarrhea. Keep out of reach of children and pets.
Good to know
How often should I water my Shield Aralia?
Water your Shield Aralia when the top inch of soil feels dry, typically every 1-2 weeks. Adjust frequency based on humidity and season.
Why are my Shield Aralia leaves turning yellow?
Yellow leaves can indicate over-watering or poor drainage. Check the soil moisture and ensure the pot has adequate drainage to prevent root issues.
What light conditions are best for Shield Aralia?
Shield Aralia thrives in bright, indirect light. It can tolerate partial shade but should avoid direct sunlight to prevent leaf scorch.
How can I increase humidity for my Shield Aralia?
To increase humidity, mist the leaves regularly or use a humidifier nearby. Placing the pot on a tray of water with pebbles can also help.
When is the best time to repot my Shield Aralia?
Repot your Shield Aralia every 2-3 years or when you notice roots growing out of the drainage holes, ideally in spring.
Is Shield Aralia toxic to pets?
Yes, Shield Aralia is mildly toxic to pets and humans. Ingestion can cause gastrointestinal upset, so keep it out of reach.
How do I propagate Shield Aralia?
You can propagate Shield Aralia through stem cuttings or division. For cuttings, take a healthy stem, place it in water or soil, and keep it warm and humid.
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