Hibiscus Leaf Drop and Sticky Residue: Root Rot Plus Insects

Rebecca has five hibiscus in a west-facing garden window. Leaves yellow and drop; some droop despite wet soil. Sticky substance found on leaf undersides at stem junctions, but no visible webs or insects.

Expert Answer: Overwatering caused root rot—roots can't uptake water, so leaves droop. More water worsens rot. Sticky residue indicates spider mites or aphids. First, drain excess water (remove tray, let drain in tub). Don't water until soil is dry. Watering method: insert bamboo skewer; water only when it comes out dry. Water half the previous amount. Empty tray after 1 hour (turkey baster). Roots will regrow in ~3 months. Meanwhile, spray rubbing alcohol in leaf crotches and on all leaf surfaces every other day for 10 days, then twice weekly for 2 weeks. Move outdoors in semi-shade when nights >60°F for faster recovery.