Ahh, thank you. "when dormant".
>> Not sure I'd try it, tho.
Hmm, I'll let it grow for a few more years an d collect some seed first.
I'm still puzzled that it som ehow got from seed trays in my bedroom into this raised bed (in 2011), yet I never saw it before now! Or maybe it was only leaves for the first year or two.
I suspect it must have gotten into that bed when I gave up on those rows in that tray, say around June 2010 an d threw the soil mix into that bed and raked it around. Some seeds have really funny stratification requirements!