I planted 2 hibiscus about 5 years ago they are about 4 foot tall. One hibiscus blooms every year and the other has never bloomed.

Question

I cannot figure out why when they are right beside each other and there is plenty of air circulation.Wondered if you might know the problem it is not blooming.

Answer 1

Does the one that doesn't bloom get more shade than the other? Were they the same age when you planted them? Some can take years to bloom.

Given your hardiness zone, I'm going to assume these plants are all in pots and are receiving the same care. I think this article may have some answers for you:

https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm

This may also be helpful: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-container-care.htm