hmmmm.. how many do you have... wouldnt it be best to try multiple options.. and discover for yourself which works best ....

on the one hand.. i speculate.. that doing it as early as possible ... to give whatever roots there are.. time to settle in .... before the stress of leaf push .... [presuming there is a good amount of roots] .... i would argue .. that severely stressing the root system.. right at or after leaf push.. may just be too much ... [e.g. i transplant trees/conifers.. as soon as the ground thaws .. giving them 4 to 6 weeks to start root processes .. before leaf push ...]

in the alternative... it may get needed resources from momma... at a most opportune time ... and allowing full maturation of leaf development.. might be in your favor..

how much root system is there???

i await the thoughts of others with direct knowledge ...

ken

I think...

As long as there is a decent amount of roots already, you could sever the link now, but I'd bet that you would get best results if you severed the link in early spring after leaf-out. The high shoot/root ratio (as long as the foliage/root ratio is not too high) and the active growing season should result in rapid root development to make up for any lost nutrients provided by the link. This is really a very similar situation to when is the best time to transplant a tree (except with a few of the variables changed).

Ken, I assume there will be sufficient roots as they have had the fall and winter to establish. But I think I will heed Brandon's advice and wait until after leaf out to avoid over stressing the babies. I do have a fair amount of potentials and could experiment with some, but don't want to lose any. I love participating in this process. Thanks for the advice!
Jm

I dont know how much quicker you are referring to. Last year I layered a honeysuckle vine in late summer and after 2months time severed it from the mother plant. I was ok with the roots it had but wouldnt want to sever it any sooner. Layering in early spring the ground wont be warm enough for the root system to develop very fast.

I would say if after checking the root system waiting for some new growth would be beneficial. From there I would just follow my instincts.

I am not trying to do something in less than 2 months. I layered in August/September 2011 and will be severing from the mother in late March or April 2012. I've decided to not sever them before leaf break but right after and then give them a week or two before moving them to their pots. The second part of my question was; I will try layering some new growth in the spring to transplant in the fall - 3 months later. I'd really like thoughts on this. Anyone have experience with this? Will they have enough time to root?