How to prune an Oakleaf Hydrangea to encourage denser growth
I have an oakleaf hydrangea ("Amethyst") that I planted in 2011, which has grown very fast to about 5 feet. It is quite rangy with some of the branches lying on the ground. I also have a much older Snowflake oakleaf hydrangea (which was already big when I moved here) that has a much better shape, with dense upright growth from the base. I'm wondering if there is anything in the way of pruning that would encourage such a habit in my younger shrub, i.e. more new shoots from the base. Thank you for any advice.