When do I start this process?

Question:

I live in central Michigan. When do I plant the seeds and set the jugs outside? Does this work for all vegetables and perennials? I'm especially interested in starting sea holly from seed. Any suggestions?

Answer:

Hi,
Most generally, you place the seed sown containers outside around the last week of December.

Regarding which vegetables and perennials, I can't think of on vegetable or perennial that won't come up via wintersowing. Here is a small list of vegetables: List of Vegetables. I'm not personally sure on sea holly, but you could always give it a try!