concludes that delaying rooting hormone applications for one to
two weeks after planting signi ficantly increased rooting of the cuttings
that were planted in peat. Delaying applications may have played
some role in stimulating the vascular cambium to produce callus tissue
from which root initials developed. Most roots appeared on the slanted
cut end of the cuttings (Fig. 3), suggesting that the slanted cut made a
larger part of the vascular cambium accessible to the rooting hormone
and also opened the possible barrier caused by the ring of phloem fibers