Rescuing a Gardenia Tree from Multiple Stresses

Addressing Yellowing, Leaf Drop, and Spider Mites

A gardenia planted in ground, then repotted with pine bark/sand/peat, fertilized heavily (osmocote, seasol, lime, epsom salts), and sprayed with white oil shows yellowing, browning, curling leaves, and spider mite webbing.

Critical Corrections

• Light: Morning sun only; afternoon shade essential.
• Soil pH: Gardenias need acid soil. Lime raises pH—stop using it. Use acid fertilizer (Miracid, Hollytone).
• Watering: Water by weight—thoroughly, then wait until pot light. Overwatering causes root rot; underwatering attracts mites.
• Spider mites: Oil spray may help. Check nearby plants for webbing.
• Pruning: Only after summer heat or before it arrives. Leave green leaves; yellow ones fall with light touch.
• White balls on roots: Perlite (soil additive), not osmocote.

Visit a garden center with a bagged sample for mite ID.