I've got 2 new hydrangeas this year. One is only about 2 feet wide and 2 feet tall (tag said it would be 8-10' tall) and a little baby one, just barely a foot tall, and not wide at all (it will be about 3'x3'. I would like to lower the pH and I've tried the sulfate pellets that Epsoma sells. It worked, but not enough. I heard that dried coffee grounds works. And I've got some saved, I use coffee grounds/banana peels/water on my roses. But I'm not sure how much? Has anyone else ever used coffee grounds on their hydrangeas?