How can I prepare my knockout rose bushes in my yard for snowy NH
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Rwk16133092
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Knocks outs are super strong and hardy roses, just make sure they have a good layer of mulch and you can even trim them back now or wait till early spring.
More info here:
https://www.gardenupgreen.com/2017/08/easy-growing-knock-out-roses.html
Also do not fertilize them after August. That grows tender new growth that probably won't make it through the winter. I always cut mine back in the fall. I have too much clean up to do in the spring and that takes one thing off my list. I cut mine severely back about every 4 yrs because they will get about 4 ft tall and leggy if I don't. I prefer a most compact bush. Knockouts are my favorite because they can really take a cold (Polar Vortex) winter and the extreme summer heat.