I have several bushy plants that are about 7 years old. One is a California Sage plant, the other a CA buckwheat, and the last is a lavender. I have cut the Buckwheat back every fall, but not the other two and now the insides of the other two are brown and look dead even though they bloom every year.
My question is should I cut them back to let the interior see some sunlight? Or should I pull them out and replant new ones?