Answer: You can treat them as houseplants for
the winter if you have space (and/or install florescent lights in your garage). They require lots of sun and
watering about once per week. Feel free to cut them back,
since they'll send out new, tender growth and blooms. If you
don't have lights, put them into dormant storage.
Gradually reduce watering, and when the foliage dies back,
store them in a dim, cool (40-45F) basement or garage.
Check them occasionally during the winter to make sure
they don't dry out completely but don't overwater or they will rot. In spring when danger of hard frost
has passed, repot, water, and place them outside. After a
year or two, your geraniums will become woody and
produce fewer blooms - at that point, you can start new
plants from cuttings. Some gardeners will also start new cuttings each fall and overwinter the cuttings as houseplants rather than storing the larger plants. This is helpful if you are low on space.
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