Answer: Cut the spent flowering stalks down to the ground. Selectively trim out the brown leaves. As a general guideline, you don't want to cut back all the foliage in fall because the plant won't have anything to photosynthesize with to store energy for next year's growth and bloom. Cannas are warm-season growers and as temperatures cool further, their growth will slow down for winter. Depending on how cold it gets and what the microclimate is in their planting site, they may suffer frost damage this winter. Don't worry, they'll come back next spring. Reduce watering in winter, as overly moist soil will promote root rot. It isn't necessary to dig and store these rhizomes.
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