How to Grow Pennyroyal

Sow pennyroyal seeds in spring to have plants in the current growing season or in late fall if you want plants first thing the following spring. If you live in the far northern United States or above, it is best to plant pennroyal in the spring. Barely cover the seeds with soil, planting them only 1/8th of an inch deep.

Plant pennyroyal in a dedicated spot in the garden. Pennyroyal is an aggressive spreading herb which sends shoots out from its roots from which new plants pop up. It takes over its surrounding space, so plant in dedicated beds or grow it in pots. If growing in pots, choose at least an 8-inch pot.

Grow pennyroyal in full sun or partial shade. Pennyroyal is adaptable to many light conditions, but does not thrive in full shade.

Keep the soil around pennyroyal moist. Pennyroyal can tolerate periods of drought, but for best results with the herb, water once every few days to keep the soil moist.

Reseed pennyroyal every spring or fall. Pennyroyal is occasionally hardy, but does better if you start over fresh every year.