How to Protect Rose Campion, Red
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Rose campion, or Lychnis coronaria, is a biennial (or short-lived perennial) that grows to a height of 2 to 3 feet. It has silver-gray leaves that are in opposing pairs on the stem. It takes two years of growth for rose campion, red to bloom with a profusion of trumpet shaped flowers. The flowers open one at a time and last for one day. The plant continues to bloom through the spring and summer. It's a hardy plant but will do even better if you protect it during the winter.
Plant perennials like rose campion in the spring instead of fall if you live in colder areas. This allows the plant to have time to fully establish before the first winter.
Make sure the planting bed containing rose campion has sharply-draining soil. The plant has been known to die from the rainy winters in the Northwest.
Consider putting the perennial in raised plantings if you live in a climate with little snow cover. This will further protect the plants from freezing temperatures and moisture during the winter.
Add a layer of mulch or straw to the soil as winter sets in. Make sure there is an inch of it throughout the planting bed.
Add even more straw or mulch around the crowns of the plant to protect it from the freezing and thawing that occurs in winter.