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you can cover it but you risk getting botrytis aka bud rot and pm powdery mildew from the humidity going up from being covered depends on how long you cover them for and if they get hit with sun right after .and you can get botrytis from the rain hitting them also what i do is just as soon as its done raining i go and shake the rain off my plants so they can dry up faster you never want to let rain sit on your plants exp from 4 weeks on cause buds are like a sponges and you will get rot...second question most people take the tops off of there outdoor plants first then they let the bottoms go a week or two later to get better yields and finish up cause soon as you cut a branch off the energy that would be going to that branch goes to the next set of branches and the rest of the plant ....jorge cervantes canna bible and grow dvds will help you a lot