Gardenia Branch Dieback: Nematode Suspect and Neem Drench Trial

Progressive Branch Death = Root Problem

One branch at a time withering, browning, dying = vascular wilt from root failure. On gardenia, two main causes:

Experimental Neem Drench

Neem oil (cold-pressed) contains azadirachtin—nematostatic and fungistatic. Protocol:

1. Mix 1 tbsp neem + 1 tsp soap per gallon water.
2. Drench root zone thoroughly (soak soil to pot bottom or 12" deep in ground).
3. Repeat every 2 weeks × 3.
4. Mulch with composted manure (boosts beneficial microbes).

Grafted vs. Own-Root Gardenias

Grafted (on Gardenia thunbergia rootstock) resist nematodes. Own-root (cheaper) are highly susceptible. Check purchase records.

Neem drench is low-risk, low-cost trial. If no improvement in 6 weeks, send root sample to nematode lab.