Container plants generally have a better root system and transplant best in the spring and early summer months. If you must plant in the late spring, stick to container roses. Spacing depends on variety and growth rate. Average spacing is three to four feet apart, five to six for vigorous growers. Dig a hole large enough to suit the root system without crowding.
Depth is critical.
Spread the roots around the mound. Partially fill the hole with soil. When the roots are covered, add water to fill the hole and allow the water to soak in. Finish filling the hole with soil. Form a four-inch high ring around the outside of the planting hole to direct water to the roots.