Some folks here have noticed if they wait until after June 1st to install them outdoors, pm is reduced. I did it last year and I'm going to wait again this year. It's anecdotal at this point. I'll still get them going to make good roots and a good size plant. Your 4/20 may be a good time for me too.We have sun today and we have not seen it in weeks. Sun and blue skies what a beautiful thing. The Pineapple Chunks I will grow this spring says it is PM and rot resistant. I hope it helps keep the rot away. I would hate a repeat of last year.