Why Are My Aster Heads Drooping

Question

My asters have lots of buds however when they start to show a little colour they begin to droop

Answer 1

Are they getting enough water? If so, check for bugs like spider mites or scale which can weaken the plants.

https://www.gardeningknowhow.com/ornamental/flowers/asters/managing-problems-with-asters.htm