Q.why is my butterly bush turning yellow in the middle of the bush, but still blooming?
This bush is in full sun (6 hrs) within close proximity to 2 other butterfly bushes. It is the largest one in the grouping. It has been beautiful for 3 years until now. There are no signs of insects on the leaves.
We did experience it being nearly uprooted last Sept. during Hurricane Florence. I replaced it in the ground and tethered it in, and it appeared to be doing well.
What do you think may be the cause of the yellowing? This just started 2 weeks ago in very hot summer heat in coastal NC.
Certified GKH Gardening Expert
Since the main vein of the leaf is still green it may be iron chlorosis. Here is how to correct it plus other reasons for yellowing:
https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/yellow-butterfly-bush-leaves.htm
https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm
