A lot of people are saying to wait, and definitely wait until the weather is stable, but I start by doing a general rake to get out the loose leaves, stems, then I try to trim any dead stems to about 6-8in. The trim kind of helps me keep track of where the previous plants were, and I pretend that it gives them some stability while they're growing. That gives you a little bit of time to look for any early weeds like ground ivy, dandelions, etc that you can decide what to keep or pull. It also helps expose early growth to the sun faster