100+ Peppermint Seeds(Mentha piperita) Heirloom Perennial HerbalPeppermint (Mentha x piperita) is grown for their leaves which are used to flavor vinegar and jelly (often served with roast lamb and other meats), and to enhance thirst-quenching cooling beverages. Sowing Start seed indoors 8 to 10 weeks prior to last spring frost. Or, sow directly outdoors in partially shaded, moist soil. Sows best through softwood cuttings. Also Sows well through rootball division. Mint seeds generally germinate between 12 and 16 days. Planting and harvesting Mints should be planted where they will not encroach on other plants. It is ideal for outdoor,container and hydroponic culture. Mints grown outdoors prefers full sun. Mint revels in deep, rich, moist ground and requires little care except manicuring or fertilizing in the spring. However, as the stems grow rapidly and the leaves become thin and small as the season advances, it is advisable to cut down from a third to a half of the patch when 6 or 8 inches high, drying the leaves and putting them in tight jars for winter use. Then soak the cut over area with liquid manure to stimulate a second crop of foliage. A month later, treat another area similarly. Thus a succession of succulent foliage may be had all season.