Spring cutting back of St. Johnswort - Knowledgebase Question

McKeesport, PA
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Question by n2thfuture
March 31, 2006
I planted 3 Golden Cup St. Johnswort (Hypericum androsaemum) last spring. They did extremely well through to fall. Dusing the winter they went to a dry

Answer from NGA
March 31, 2006
Your zip code places you in zone 6A or the coldest part of zone 6. Depending on the microclimate where you garden, it may be as cold as zone 5. This is a bit borderline for this plant in terms of cold hardiness. The first year is typically the most difficult because the plant is not yet well established, but this hypericum is not in all likelihood going to be evergreen or semi evergreen for you. (Listings I am finding classify H. androsaemum as deciduous in any case.) In most winters it will probably die back substantially if not all the way to the roots. You would trim away any dead stems in the spring and hope for new growth. Dead stems will be discolored, dry and brittle with no green inside. Since you are in a cold area, it is a good idea to mulch it heavily in late fall each year. I hope it came through for you!

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