Pruning Roses in Mild Climates

Hybrid Teas and Grandifloras. By winter, these are 8-10 feet tall and lanky. Prune established bushes 2-4 feet, leaving 4-5 major canes averaging 3 feet. Remove older canes to trigger basal breaks (new cane growth) in spring—fundamental to bush health.

Floribundas and Polyanthas. Since these are for garden display, allow more older canes for increased flower production. Cut back about one-third of new growth, leaving substantially more stems than for hybrid teas. Leaving more canes maximizes flower production.

Miniature Roses. Most are own-root. No bud union, no suckers. Precise pruning is labor-intensive; many rosarians use hedge clippers to trim tops at a foot above soil (height varies). After, remove twiggy growth and open center for air circulation.

Old Garden Roses and Shrubs. Don't treat as modern hybrid teas. For maximum blooms, prune lightly—more grooming than severe. Prune only last year's growth; prune one-time bloomers immediately after flowering; repeat bloomers in winter or early spring. After a few years, prune back some oldest canes yearly to promote basal and post-basal breaks. Balance new and old growth is key.

Climbers and Ramblers. Climbers flower profusely only when canes are trained horizontally. Cut long-established canes to slightly thicker than a pencil. Cut each side stem that flowered to the lowest five-leaflet stem, 1-2 inches from main cane. This causes flowering along the complete length for a spectacular spring display.

Tips for After Pruning

Follow these to reduce disease potential and encourage vigorous growth:

1. Thoroughly clean rose beds of dead leaves and debris. Bag all pruned material; don't use rose stems for mulch or compost—fungal spores can reinfect.

2. Apply dormant pesticide or fungicide spray immediately after pruning when no eyes are developing. Use oil-and-sulfur spray to destroy powdery and downy mildew spores in soil and on canes. Mix inorganic sulfur compounds with horticultural oil per label.

3. After brushing the bud union with a wire brush to remove old bark, cover with 6-10 inches of surrounding mulch. This protective mound keeps bud union moist and receptive to new canes, and protects from mild frost. Some experts avoid this, believing it promotes crown gall.

4. Avoid fertilization until 3-4 weeks after pruning. Then apply 1-2 cups balanced granular rose food around base of mound, then uncover bud union. Mulch provides clean landscaping surface for the new year.

Pruning in a Winter Climate

In colder climates, most advice still applies. Northerners have fewer height decisions. Despite winter protection, canes die and must be cut back severely.

1. Remove all diseased and dead, blackened canes and prune a little more off each remaining cane until center pith is creamy-white, not brownish.

2. Remove weak, twiggy growth and crossing canes. Stand back and admire—severe winter also kills most insects and fungal diseases.

3. Never prune in fall, as it encourages new growth and more winter kill.

4. In spring, wait until all danger of severe weather passes before uncovering and pruning. As the saying goes, when forsythia blooms, it's time to prune.

Pruning Checklist