Troubleshooting
Merrill's Wax Plant problems — and how to fix them
Merrill's Wax Plant (Hoya merrillii) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bud drop in low humidity
If ambient humidity falls below 50% when buds are forming, Hoya merrillii will abort its buds; maintain humidity above 60% during the budding period and avoid moving the plant.
Scale insects
Brown, shell-like scale can colonise stems and leaf undersides; scrape off manually and treat with horticultural oil or a systemic insecticide labelled for houseplants.
Prevent merrill's wax plant problems before they start
Most merrill's wax plant issues are care-mismatch, not bad luck. Dial in the basics:
Merrill's Wax Plant problems — FAQ
Why is my merrill's wax plant bud drop in low humidity?
If ambient humidity falls below 50% when buds are forming, Hoya merrillii will abort its buds; maintain humidity above 60% during the budding period and avoid moving the plant.
Why is my merrill's wax plant scale insects?
Brown, shell-like scale can colonise stems and leaf undersides; scrape off manually and treat with horticultural oil or a systemic insecticide labelled for houseplants.