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Winterizing plants

I am not able to find a source of information regarding which perennials need to be cut down in preparation for winter, trimmed, or what. I learned this lesson when I cut down a spirea before winter, and it is still struggling to come back. I live in zone 8.
Submitted by BHGPhotoContest

For most perennials it makes little difference if they are cut back in fall after they have frozen back, or in late winter. The key is to wait until they die down naturally. Avoid pruning in early fall, because that can stimulate new growth that will freeze off over winter.
If you have diseased plants, it is a good idea to cut off the diseased portions before winter to avoid carry over of the disease to next season.

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How do I find out what zone I am in, Salt Lake City, Utah 84084.I don't want my plants to die just because I don't know what to do with them in the Winter? Is there a chart or list of ways to treat each individual plant? I am new at this.
Submitted by juliastevens24
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Submitted by juliastevens24