Do Hydrangeas only bloom on old growth, not new?
This winter was cold and very snowy. Every hydrangea I have seen this season had its old above ground growth killed back, so that all of last year's stems were dead. That means none of the leaf buds ever grew, so all above ground stems had to be cut back to just above ground level.
After April went onto May, we started seeing lots of new stems growing from the base of hydrangeas, and most plants I have seen had enough new stems grow that the plants became nice and thick again. No problems.
But now that we are into almost mid July, I see no evidence of flower buds forming on any, except for a few large Oak leaf hydrangeas. That has made we wonder if hydrangeas only bloom on old, previous year's growth, and not on new growth? Summer bearing raspberries and blackberries do this as well.
I am surprised I dont know the answer to this already, from previous year's experience, but I guess I just never paid that close attention to which stems the flower buds formed on....