Diagnosing Twisted New Growth on Schefflera

Likely Causes of Leaf Curl and Blackening

Your detailed history helps narrow the possibilities. The twisted, blackening new growth system-wide suggests a physiological issue rather than a spreading pathogen.

Top Suspects

1. Root binding / poor root integration: You repotted into an 18" pot without loosening the root ball. If roots were circling, they remain trapped even in a larger pot, unable to access new soil. This causes water/nutrient uptake issues, manifesting as distorted new leaves.
2. Irregular watering during your absence: Five weeks of uncertain care (over- or under-watering) can damage root tips, leading to subsequent growth abnormalities.
3. Pot too large: Scheffleras over 6 ft rarely need >14" pots. An 18" pot holds excess moisture, risking root rot.

Scale? Probably Not the Primary Cause

The 6–7 brown spots on older leaves that flicked off are likely old, dead scale. Check new growth carefully—if no crawlers or sticky honeydew there, scale isn't driving the current symptoms.

Recommended Actions

1. Send photos of the twisted leaves, whole plant, and root ball (if you can unpot) to wcreed@HorticulturalHelp.com.
2. If root-bound: Gently remove plant, tease/prune circling roots, repot into a 14" pot with fresh soilless mix.
3. Water correctly: Wait until top 1/3 of soil is dry, then water thoroughly.
4. Light: Move to brightest indirect light possible (south/east window).

Scheffleras are resilient. With corrected roots and consistent care, new growth should normalize.