Roses that are leggy and bare at the base need aggressive renewal pruning—even in early summer. Cut the entire plant back to about 12 inches. This forces dormant buds at the base to break, creating a dense, bushy framework.
In Arlington, Virginia, early summer pruning gives the plant months to regrow and harden off before winter. Water well after cutting, and apply only a light feeding with a slow-release fertilizer like Osmocote 14-14-14 to avoid excessive soft growth.
High-nitrogen fertilizers encourage the long, weak canes you're trying to eliminate. Switch to a balanced or bloom-boosting formula with lower nitrogen.
Pinch or trim any cane that outgrows the others during the season to maintain an even, rounded shape.
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