Yes, you can purchase both one and two year old roots for use as planting stock.

And, you are correct about dry vs. wet weight. We always figured 3.5 lbs wet to equal 1 lb dry.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.