The Q&A Archives: Hardiness

Question: Dear Sir;
My landscape disigner called for planting Pink 'n Pretty Hydrangea, purchased from a local nursey. After they were planted,I read the tag,which said for zone 7-9. As far as I know I'm in zone 5-6 northwest NJ near the penn state and NY borders. Do I have to protect these plants and how?

Answer: According to the Monrovia web site plant listing, Pink N Pretty (Hydrangea macrophylla 'Monink') is winter hardy in USDA winter hardiness zones 5 through 9; it is also listed as suited to summer heat zones 7-9 which is a separate rating system. So, you should be fine. (Your zip code places you in winter hardiness zone 6A or the coldest part of zone 6 and depending on your microclimate it could actually be as cold as zone 5 just as you described.) I would suggest though that you mulch generously over the root area in late fall after several hard freezes. You may also want to provide a wind break for the plants if they are in a windy location. Do not do any pruning on these until late spring at which point you can trim off any winter damaged stems. Good luck with your hydrangeas!

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