White Knock Out Rose
Rosa x hybrida 'White Knock Out'
Essentials
At a Glance
Plant Type
Shrub
Height
42 inches
Width
42 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
Moderate
Humidity
Prefers moderate humidity
Lifespan
Perennial shrub
Native To
Cultivated hybrid
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Rosa x hybrida 'White Knock Out' is a compact, bushy shrub with glossy dark green foliage and large, pure white, semi-double flowers that bloom repeatedly throughout the season. This cultivar is renowned for its exceptional disease resistance, vigorous growth, and continuous flowering, making it a low-maintenance and reliable choice for garden borders and containers.
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck bare roots in early spring, 1 inch below soil surface.
- Water thoroughly after planting to settle soil.
- Prune lightly in late winter to shape plant.
- Fertilize with balanced rose food in spring and mid-summer.
- Mulch around base to retain moisture and suppress weeds.
- Monitor regularly for pests and diseases.
Pro Tip
Ensure good air circulation to prevent fungal issues.
Keep It Thriving
Care Guide
Do
- Water deeply once a week 🌱
- Prune dead or damaged branches in winter
- Fertilize regularly during growing season
- Mulch to conserve moisture
Don't
- Overwater to avoid root rot ❌
- Avoid heavy pruning in late summer
- Don’t plant in overly shady spots
- Skip fertilizing during dormancy
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Mulch | ||||||||||||
| Pest Check | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
White Knock Out Rose questions
What zones can White Knock Out Rose grow in?
White Knock Out Rose is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is White Knock Out Rose deer resistant?
Not reliably. Deer may browse White Knock Out Rose, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does White Knock Out Rose bloom?
White Knock Out Rose typically blooms in spring to fall through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does White Knock Out Rose need full sun?
White Knock Out Rose does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is White Knock Out Rose drought tolerant?
Yes — once established (usually after the first full season), White Knock Out Rose handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Rosa to compare
Flutterbye Rose
Rosa x hybrida 'Flutterbye'
Joseph's Coat Rose
Rosa x floribunda 'Joseph's Coat'
In Your Eyes Rose
Rosa x hybrida 'In Your Eyes'
Rainbow Rose
Rosa x hybrida 'Rainbow'
Twilight Zone Rose
Rosa x grandiflora 'Twilight Zone'
Fun in the Sun Rose
Rosa x hybrida 'Fun in the Sun'
Keep exploring
Explore the genus
Collections featuring this plant
Grow White Knock Out Rose with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
