Pycnanthemum muticum (Clustered Mountain Mint)

The cluster mountain mint has such a sharp mint scent that it could wake up deaths. It’s neither a true mint nor is it the showiest plant in the garden, but it is one of the best insect-repellent plants for mosquitoes, flies, and other insects.

In the garden, it can be planted as a natural pest-repellent border or near outdoor seating areas where its scent helps reduce insect pressure. Crushed leaves can be rubbed on skin or clothing in traditional use contexts as a short-term insect deterrent, and sprigs can be placed indoors in bowls or hung in bunches to help discourage flies and moths. It is also sometimes used in dried form as part of natural insect-repelling sachets for cupboards and storage areas.

The leaves can be used in small amounts as a minor tea herb, although caution is advised due to the presence of pulegone and related compounds in some mint-family plants, which may be hepatotoxic in high doses. For this reason, it is best treated as an occasional-use aromatic rather than a daily medicinal tea herb.

In the garden, clustered mountain mint is a very hardy and adaptable perennial. It grows best in full sun to light shade and prefers moist, well-drained soil, although it can tolerate a range of soil types once established. It is highly frost-hardy and will die back in winter before reshooting strongly in spring. But it also does well in our warm-climate port-Stehens area. Regular watering encourages lush growth, particularly in hotter climates, but established plants show good resilience to short dry periods. Overall, it is a low-maintenance, high-utility herb best suited to ecological gardens and insect-supporting planting schemes rather than ornamental display beds.