When I bought a beautiful lemon tree from Greensgrow over the summer, the fruit had formed, but was hard and green. By the time October came, and it was cold enough outside to damage this heat loving citrus, I brought it in and placed it in a south facing window, lemons still unripe. I read up and learned that they can take up to nine months to ripen, and need of plenty of water to do so. I kept watering and rotating the container, making sure the tree was getting good sun, and two months later, I harvested three lemons. And tonight, I made a quart of lemonade from the half cup of juice they yielded! Refreshing on this 60 degree night.