Chicago Botanic Garden staff waits until there has been a hard freeze of around 18 degrees Fahrenheit or three nights in the low 20 degrees before beginning the winterizing process.
I will be leaving for a two-week vacation on Nov. 10 and was wondering if I should prune back my hybrid roses and cover them before I leave? — Tyler Jackson, Crystal Lake It is probably best to winterize your hybrid roses after you return from your vacation. Generally, this happens around Thanksgiving, with the work being completed in the first week of December, even if the temperature minimums have not been met. The roses are cut to about 18 inches to make it easier to mound them.
Cut hybrid roses to about 18 inches and mound well-aged horse manure up to 15 inches high over the base of the plants. There is no need to take these special maintenance steps with landscape roses, which should be treated like other shrubs in your garden. Most home gardeners have landscape roses. These do not need to be cut back and mounded with compost. On the other hand, David Austin roses can benefit from some extra winter protection.
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