Residues of lead arsenate, DDT, and other persistent pesticides may be in soil.
Pruning is an important step in the life cycle of a rose tree because it is the key to bearing great flowers. Perhaps going against a widespread belief, note that pruning rose trees is best done at the end of the winter, in February or March depending on the climate zone, in any case at the very beginning of bushmulch.barted Reading Time: 2 mins. Feb 16, Pruning Roses in Spring Tree roses respond well to heavy pruning during their dormant period.
In cold-winter areas, prune them in early spring. May 02, Another technique that gardeners in warm areas can try is to remove all the leaves from their rose bushes when they do their spring pruning. This fools the rose into a brief period of dormancy and lets it start fresh for the season.
It’s also a good way.