I have 4 hydrangeas. I water them weekly with diluted aluminum sulfate. Many are blue and some are pink and purple. Should I be putting this solution a foot around each bush? I pour it down the center but are roots a foot apart from center. I use a gallon of water and 1 tbs of sulfate for each plant, so should I add more solution to non plant areas to get roots all over saturated with diluted aluminum? Should I increase to 2nd for each gallon to make solution a little stronger? Also, some bushes have 3 tall stalks and the rest if the bush is low. Should I cut this stalks down? One bush has very few blooms on it right in between my other bushes which have tons of blooms. I don't know why I don't have the same amount on this one bush? It was and is treated the dame as all the others.
Pruning/Changing Color of Hydrangea
Certified GKH Gardening Expert
You can water the entire drip line of the plants with your fertilizer. I would not increase your ratio.
I am listing a few links for you, including pruning information.