Reviving a Struggling Black Aralia: Expert Care Tips

Understanding Your Black Aralia

The Black Aralia (Polyscias balfouriana), also known as the Dinner Plate Aralia for its large, striking leaves, is a stunning tropical plant that can reach impressive heights indoors. However, as one Chicago-area plant owner discovered, even a well-established specimen can suddenly shed leaves faster than it produces new growth.

Diagnosing the Problem

Kevin's 8-foot-tall Aralia, housed in a sunroom with east-southeast exposure, showed classic signs of stress: only the top few inches of each branch remained green, while the lower stems turned woody and tan. Despite careful watering adjustments—switching from weekly light watering to biweekly deep soaks—the plant began losing leaves in record numbers come spring.

Key Care Adjustments

Light and Temperature

Although the sunroom provides morning sun, direct sunlight can scorch the large leaves and accelerate moisture loss. Move the plant to a bright spot with filtered light. The current temperature range (mid-60s°F in winter, mid-70s°F in summer) is acceptable, but avoid cold drafts.

Humidity and Misting

Low humidity (20% in winter, 40% in summer) is a major factor. Mist the foliage daily during warm months and consider a humidity tray or room humidifier. Wiping leaves with a damp sponge removes dust and improves transpiration.

Watering Technique

Overwatering and underwatering both cause leaf drop. Use the "chopstick test": insert a wooden chopstick deep into the soil; if it comes out dry 2–3 inches down, water thoroughly until excess drains out. Empty the saucer after an hour. Reduce frequency in winter.

Feeding and Repotting

The plant has likely exhausted its soil nutrients. Feed fortnightly with a balanced liquid fertilizer during spring and summer. Check for root binding—if roots circle the pot, repot into a container just 2 inches larger, using fresh, well-draining potting mix.

Recovery Outlook

With these changes—filtered light, consistent humidity, proper watering, and regular feeding—your Black Aralia should regain its lush foliage. Patience is key; new growth will emerge from the tips, gradually filling in the bare stems.