Why do you want to prune it? Is it too big? I never prune my pineapple sages. Of course mine are planted in the ground, and I want them to continue to grow.

This is the first year that the frost didn't make my plant look all ratty. I am still letting mine bloom because it is so beautiful. Before, I pruned it down to about a foot tall by this time of the year. Last year we had a frost as late as early April and slight damage ocurred to the new foliage. A few weeks later, new growth covered all the damaged stuff and the plant grew like gangbusters. I will prune out most of the older stems pretty soon and apply lots of newly-made compost, but I think I will let the flowers just do their thing until they slow down. The golden finches and hummingbirds sure appreciate it.