Non Flowering Tithonia Diversifolia

Question

I took a cutting of a tithonia diversifolia 2 years ago and it has grown VERY big and has been pruned down to 1.5 meters 3 times – but it has never had a flower. It has very dense foliage It is in full sun and on a well draining slope. How can I encourage flowers?

Answer 1

It may be that there is too much nitrogen in your soil! This will impair flowering. You may be able to offset with a blend that is high in phosphorus and potassium. This can help with soils high in nitrogen.

This article will help you with the care of the plant. Since you are in an area where it is a perennial, you can ignore the suggestion that it is an annual, as it is in my country:

https://www.gardeningknowhow.com/ornamental/flowers/mexican-sunflower/planting-mexican-sunflowers.htm