New roots on pine seedlings: Greenhouse tests with ponderosa pine seedlings indicate time of transplanting affects rooting ability of seedling

Many cut-over forests in the California pine region are producing at much less than full capacity because of the practice of relying upon natural restocking by seed from the remaining trees. Some of these areas contain too few trees, some support trees of less desirable species, and some have been occupied by brush. If left as they are, many of these areas will require fifty to a hundred years before full production is achieved.