How do they determine plant hardiness?
The United States Department of Agriculture determines the hardiness zones based on average low temperatures during the winter. While low temperatures are the most important factor, other factors such as exposure, how much wind is received and how healthy the plant was going into winter will all influence the hardiness. Winters when we have little snow cover are very hard on plants. What Zone are we in? The Twin City area is officially in the northern half of Zone 4. Zone 3 starts around St. Cloud and covers the majority of the northern half of the state. There are a few small pockets of Zone 2 in far north Minnesota. There are also sheltered areas that could be considered zone 5. Is there anything I can do during the summer to make my plants hardier? There are several cultural practices you can follow to help insure your plants winter successfully. Grow your plants lean, giving them only the fertilizer they need. Avoid fertilizing any later than mid-August. Plants growing in soggy are
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