I got seeds in a trade in the spring for pink perennial geraniums. Do I need to do anything to them in the fall or will they just come up again next spring???
It is not clear to me whether you mean hardy Geraniums or the half hardy Pelargoniums. Suggest that you consult the FAQS page at the top of Geranium Forum. If the plants are pelargoniums they are frost tender and will require frost-free conditions.