Mint will take about three months from seedling to full growth (about one to two feet high). From the cuttings, it may take only a few weeks. You pick the leaves just as you require them. The tender leaves will have a more robust flavor than the older and light green leaves. During the season, it's even possible to harvest 2-3 times. One benefit of planting the mints indoors is that you get a winter's supply of garden-fresh mint leaves. The best-dried leaves are ideally cut before the mint plants flowers. Later on, the leaves are kept in a sealed container.