Q.Hollyhocks
Why are the buds falling off just as they are ready to open?

Downtoearthdigs
Answered on June 21, 2017
This could be due to insects, Thrips can infest the buds and strip them form the plants.
Here is an article with more information.
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm
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