Posted: 20/11/2014 at 08:37
Swiss sue. You don't menation what varieties of pennisetum you have.....some are extremely tender......pennesitum rubrum varieties need to be over wintered indoors at a min of 4degrees.
Agree with WillDB, cut back most grasses in spring. Here, where it's mild, I can get away with cutting them back in autumn and they are fine. I also cut back tenuissima hard and divide them In spring.