How to protect roses in the winter<br>Reduce water and fertilizer 6 weeks before the first frost. This is a popular technique among rose gardeners, known as " hardening off. " reduce the water by half and stop fertilizing altogether to help prepare your roses for the cold weather.
Fertilizing roses will kill them if it's cold.
( z1 kill :ARG0 ( z2 fertilize :ARG1 ( z3 rose :ARG1-of z1 ) ) :condition ( z4 cold :ARG1 z3 ) )