My Paulownia Won’t Flower ?

Question

I live in the Niagara region of Ontario 6b almost 7zone I have had my paulownia since 2015. It is about 20 feet tall and 10 feet wide consisting of 3 trunks joined at the base. It grows fantastically some branches 10 feet in one summer but it has never flowered ?? Any idea why? I take great care of it. Thanks Amy

Answer 1

It appears that you are on the very lower edge of where it can survive. This will mean that winter damage will be common. This is, likely, the cause of lack of flowering.

You can try mulching, and adding a little fertilizer that is high in phosphorus and potassium to try and mitigate the issue, but it will likely continue.

With age, the tree may begin to flower, but this is not guaranteed.

Here are some articles that will offer more information on the tree:

https://www.gardeningknowhow.com/ornamental/trees/royal-empress