I do this with tomato seedlings...I have done it with pot as well.

As stated above a luke warm bath is best, but if rootbound, I have found that the peat inside the rootball won't wash out easily;
So I just transfer to hydroton filled netpot and no worries.

It is not as hard or scary as it sounds. Just do it. Make sure not to damage roots.

a third alternative I have found is to take a small container to act as an overflow tray and fill 1" deep with perlite. After that fill water to top of perlite, dig a hole for the plant and set in...In a couple of days the roots will have worked into the perlite, and thus you can transplant to hydroton filled netpots and no peat will fall into rez. Peace
latewood Reviewed by latewood on . From Soil to Hydro ?? We finally got 4 nice plants going in soil, but it seems to be going real slow , compared to hydro. and was wanting to know is it possible and SAFE to transfer them to hydro. pots to finish them off, they r about 3 weeks old at this point. Jamie Rating: 5