Gardenia plants

Question

What causes a perfectly healthy indoor plant that is full of buds to suddenly have the buds flop over and fall off?

Answer 1

It sounds like you have thrips. This article will help with that:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

I would recommend using neem oil to treat them. We have found it to be effective against pests like this. Here is more information on that:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

This article may also help: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-flowers-gardenia-buds-falling-off-plant.htm