Perennials: Bee Balm taking over my Lavender! What to do?, 1 by Pfg

Pfg wrote:
My patch is in a spot that gets a little too hot for it. It spreads like mad over the winter, this year growing back toward the Sibs. To one side it's hemmed in by shrubs, ferns and heavy shade, on the other, asters and white Achillea, another thug. Forward is more hot and sunny. When it blooms, it's spectacular, then as the summer heats up it burns out some. At least that's what's happened so far.

This year my irrigation system might help it a little too much... I plan to keep that section dry-ish, using soaker tubing but spread out more than in the other areas. Its competitors are all less thirsty than the bee balm, so I'm hoping that will help keep it in check. Finding the right balance will be tricky, I don't want to lose all of it!