No if you dry the trim for 1 day, then freeze it until your ready to use it. You want everything as cold as possible. It makes the trichs brittle. You want the plant material to have a little sponginess so it doesn't break into tiny pieces that go thru your screens.--------- definately always use ice, if its fucking cold there then do it outside with ice and you will have some good bubble! The colder the better. -----------the ice is needed to help agitate the trim. Breaking ice cubes into smaller jagged pieces is best.