Hibiscus and gardenia have plenty of flower buds but they do not open. They fall off. What is causing this?

Question

What is the problem when the male anthers don’t have any pollen on them? Water? Fertilizer? Temperature? It’s frustrating when I got to hand pollinate and there is no pollen!

Answer 1

Actually, pollinating will, immediately, send the flower to die. After pollination, the seeds will, then, be the most important thing for the plant to focus on, and the flower will start to decay. Holding off on pollination can prolong the flower, sometimes.

Unfortunately, too much, or too little water can both cause this as well as too much nitrogen in the soil.

These two articles will help you to address the problem.

https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-flowers-hibiscus-blossoms-falling-off-plant.htm

https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-flowers-gardenia-buds-falling-off-plant.htm