Welcome, Vicki!

If your winter lows remain above -2 deg. C, it's easy. Plant it in at least 6 hours of sun a day, in well drained neutral to slightly acid soil, and feed it regularly with a high nitrogen food--a 4-2-1 ratio with added iron, zinc, and manganese is ideal. Lemons and other citrus like to dry out between waterings--we give ours a deep soak every 2 weeks here in the desert, but yours will need it less often if your summers aren't as ferocious as ours! From -2 to -5 C, you will need to put more thought into frost protection, such as planting it on the south or west side of buildings, walls, evergreen trees, etc. Below -5 C, it would be best to keep it in a big container, and bring it indoors every winter. Container growing means more frequent watering and feeding, and a little more sensitivity of the fruit to stress of any kind. While indoors, it also needs a sunny spot, so the average garage won't cut it: it needs a big window, a conservatory, or a heated or passive solar greenhouse.

Harvest will depend on the variety. A few kinds are effectively everbearing, blooming and ripening at odd intervals. Most put on a fragrant show of blooms in early spring, and the fruit will be ready to pick in the mid to late fall--probably while it is still green. The chillier the nights are, the yellower the fruit gets, but by then it may be getting overripe, and dryish. Hope all this helps!