AJ,
I planted some last fall and when I harvested a couple of plants this year, I had enough to make about two tablespoons. They were not the largest plants, though they were decent size. I would wait another year unless the plant is quite large and you have others ready to grow.
I was told you need to wait until after a hard freeze or after a spring thaw.
I also used a food processor to chop/dice/grind it up. Let it set for close to three minutes before adding vinegar. Real nice taste but not as hot as I thought it might be, though that may be because the roots were so small.
If Pepperfever does not join in, PM him/her. She/He is the one who sent me the roots to plant last year. (Sorry J - if your name was Paul or Tom I would know your gender, of feel comfortable guessing!)
Mike