Q.Why We Have Yellow Leaves At The Bottom Of Our Butterfly Bushes?
Why we have yellow leaves at the bottom of our butterfly bushes? Our butterfly bushes are two years old, we water them once a week we live in Iowa where it’s hot and humid. They are planted in topsoil and not clay. Would the yellowing leaves be a sign that they are under watered or overwatered? Thank you

Certified GKH Gardening Expert
Yellowing leaves can be a sign of over or under watering so try watering twice a week and see if that helps, especially when it is very hot.
https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/butterfly-bush-care.htm