Double Knock Out? Rose Shrub - Rosa 'Radtko'

Double Knock Out® Rose Shrub (Rosa 'Radtko')

The Double Knock Out® Rose, botanically known as Rosa 'Radtko', is one of the most popular landscape roses thanks to its vibrant blooms, exceptional disease resistance, and extremely long flowering season. Producing rich red, double-petaled flowers from late spring through fall, this hardy shrub rose delivers continuous color with minimal maintenance. Many gardeners choose to buy Double Knock Out® roses online because they provide reliable performance and professional landscape quality without the demanding care required by traditional roses.

Landscaping Uses

The Double Knock Out® Rose shrub is perfect for foundation plantings, flowering hedges, mass plantings, and landscape borders. Its compact size and abundant blooms make it ideal for lining walkways, planting along fences, or adding color to mixed garden beds. It also performs well in large containers, bringing vibrant seasonal color to patios and entryways.

Specifications

Height: 3–4 ft
Width: 3–4 ft
Growth Rate: Moderate
Sun: Full Sun to Partial Shade
Water: Moderate; prefers evenly moist soil
Soil: Well-drained, fertile soil
USDA Zones: 5–10

Why Homeowners Love It

• Double-petaled red blooms appear continuously from spring through fall
• Highly resistant to common rose diseases including black spot and mildew
• Compact growth habit works well in small gardens and containers
• Low-maintenance rose suitable for beginner and experienced gardeners alike

Planting & Care

Double Knock Out® Roses grow best in well-drained soil with at least 6 hours of sunlight per day. Dig a hole roughly twice the width of the root ball and plant at the same depth as it was growing in the container. Water regularly while the plant establishes, keeping the soil evenly moist but not waterlogged. Light pruning in early spring helps maintain a tidy shape and encourages vigorous new growth and flowering throughout the season.