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In respect to this, do you cut back spirea in winter?
Wait until late winter or early spring to cut back the spireas. Though spirea species that bloom on the previous year's growth are normally pruned in summer after the flowering period, all spireas should be rejuvenated in late winter to early spring.
Also Know, how do I prepare spirea for winter?
Spread a 3-inch layer of organic mulch around the base of spirea shrubs before winter weather arrives. Compost or wood chips will stabilize the ground temperature, keep down weeds and amend the soil over time. Keep the mulch 4 to 6 inches from the stems of the plant.
Lightly trimming you spirea after blooming will extend this shrub's season of interest. The second pruning should occur in late fall or early spring. This pruning will usually be a more drastic trim and you will remove more plant material from the plant than during the spring/summer prune previously discussed.