Rosa Knockout 'Double' is a disease resistant shrub rose known for its abundant cherry red blooms that appear in flushes from spring to frost. Unlike traditional roses it requires no deadheading to keep flowering. Its dark green foliage has excellent mildew and black spot resistance, and its compact bushy habit makes it a standout feature in both formal and informal garden designs.
Height & Spread: 3 - 4 ft x 3 - 4 ft
Bloom Time: Spring to frost
Light Requirements: Full sun
Soil Preference: Average, well drained garden soil
Watering Needs: Moderate; prefers consistent moisture in dry periods
Deer Resistance: Not preferred by deer
Native Status
This rose is a hybrid cultivar developed in the United States. It is not native but bred for durability and ornamental performance in a range of landscapes.
WILDLIFE & INSECTS
Butterflies
- Visited by butterflies such as Painted Lady and Eastern Tiger Swallowtail which seek nectar from open blooms.
Bees
- Attracts a variety of native bees and honeybees especially in early summer when few other shrubs are in full bloom.
Moths
- Night blooming activity and fragrance may attract sphinx moths and other crepuscular pollinators during warm months.
Birds
- Rose hips that form in late summer attract small songbirds such as American Robins and Cedar Waxwings.
Spacing & Landscape Use
Spacing Recommendations:
- Space 3 - 4 ft apart to maintain natural form and ensure adequate airflow between plants.
Landscape Placement:
- Ideal for mixed borders, foundation plantings, and low hedging. Also performs well in mass plantings or as a focal point in small gardens.
Companion Plants
- Iberis sempervirens (Candytuft) - Produces white spring flowers that contrast sharply with the rich red of the rose blooms.
- Lavandula angustifolia (English Lavender) - Adds aromatic foliage and lavender spires that complement roses while repelling pests.
- Coreopsis verticillata 'Zagreb' (Tickseed) - Offers fine textured foliage and golden flowers for a warm toned pairing.
- Geranium sanguineum (Bloody Cranesbill) - Forms low mounds with pink to magenta blooms that fill in around rose bases.
- Salvia nemorosa 'Caradonna' (Wood Sage) - Provides upright purple flower spikes that attract pollinators and echo red blooms well.