buddleia

Question

I have 3 buddleia shrubs. The blooms are dying off when only one inch long. Can you help please? Thanks

Answer 1

Is there a possibility that your plants have too much shade? That's one thing that can interfere with flower productions; another thing is too much nitrogen fertilizer - work some bone meal into the soil (to increase phosphorous) and discontinue fertilizer. Another possibility would be aphids or thrips. These articles may give you some help: https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/butterfly-bush-care.htm
https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/brown-leaf-spots-on-buddleia.htm