Coaxing roses into bloom

Q. Several years ago, I dug up three roses from a garden about to be bulldozed. One rose is in the garden, the other two in pots. The plants have an abundance of healthy leaves, but they have never bloomed.
A. Whenever roses and other flowering plants have plenty of healthy looking green growth and no flowers, a common cause is an over-abundance of nitrogen (N) in the soil, without balancing amounts of phosphorus (P) and potassium (K). Fertilizer labels indicate levels of each of these major nut