Hello! Im from Pittsburgh (verona) too, i have no advice for you as my annabelle is doing kinda crappy, but i was wondering where you found your hydangeas? I coulld use a couple more! Its nice to meet a neighbor!

Make sure to keep watered until the ground freezes. Mulch the area well. They'll be fine - they're hardy as bones. :0)

mxk3 is right-water and mulch. I would wait to mulch now until a freeze or at least several very cool nights, so you don't give all those bugs a nice warm bed for winter.

Eleven Annabelles? Wow! I will bet that looks awesome in a few years. Fertilize those babies with a 1/2 cup of manure, compost or cottonseed meal in June only and keep them well mulched. I usually recommend 3-4" of any type of mulch. They are hardy to Zone 3 so they should enjoy your garden. If your soil is not acidic, consider amending the soil to acidify it and prevent iron chlorosis on the leaves. You can find iron chelated liquid compounds at most nurseries or you can add garden sulphur, green sand, etc. There may be some wilting episodes during the first 1-2 years (mostly in the summer) but if they occur, just check the soil moisture and water when a finger inserted to a depth of 4" feels almost dry or dry. I have too few trees and get too much intense summer sun here for a hedge of hydrangeas but I wish you a good time with yours!

Thank you all so much! I got the Annabelles at Reilly's Summer Seat Farm in Ohio Township, near Sewickley.

Water, water, water! Make sure that you deep water them well until the ground is frozen. For the next season or so, they may still need supplementary water until they are well established. They will then give you years of enjoyment without too much care in future :-)