Now that we have cut so many ash trees from our property, I feel the volunteer oak seedlings that used to be a nuisance are possibly a sustainable and free way to re-forest our land. With all the moisture we have had this summer there is a number of new healthy seedlings growing in my gardens. How old do they need to be, or at the other end of the spectrum how old can they be, to safely transplant and when is the best time to do so? Can it be successfully done?