My nepeta, which is often robust and covered with flowers, has this year become sparse with yellow leaves at the base. What am I doing wrong?
Certified GKH Gardening Expert
Yellowing of the leaves at the base along with poor growth can indicate nitrogen deficiency, or less commonly, magnesium or potassium deficiency. Try supplementing with a fertilizer that provides these nutrients. Conventional and organic options are available in gardening stores.