Where to buy Pennyroyal herb plant near me? Buy online from Albert's Tomato Farm. Pennyroyal has no special gardening or growing requirements. Image Pennyroyal herb plants delivered right to your door. Pennyroyal plants release Sulphur into the air. Garden pests can not tolerate the smell. We think the smell is sweet and delightful, however, insects and rabbits disagree. Take a branch of Pennyroyal and tie it on your pet and Pennyroyal will keep the flies and ticks at bay. Buy many and Plant Pennyroyal in your garden or plant her in a hanging basket. Make a great house plant as well.