White Mountain Knotweed
Persicaria amplexicaulis 'Alba'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
42 inches
Width
36 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8
Water
Medium to wet
Humidity
Average
Lifespan
Perennial
Native To
Himalayas
Toxicity
Non-toxic
The Story
Plant Bio
Robust perennial with lush green foliage. Alba cultivar features stunning white flowers that stand out in garden spaces.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
We couldn't find this plant listed online right now.
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Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and promote root growth.
- Transplant seedlings when they are sturdy and have developed roots, typically after 6 weeks.
- Water consistently to keep soil moist but not waterlogged.
- Mulch around plants to retain moisture and suppress weeds.
- Prune lightly after flowering to encourage bushy growth and remove dead stems.
Pro Tip
Use well-draining soil with organic matter for optimal growth and vibrant blooms.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist 🌱
- Provide full sun for vigorous growth
- Mulch annually to conserve moisture
Don't
- Avoid overwatering to prevent root rot ❌
- Don't disturb roots during flowering
- Refrain from fertilizing late in the season
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Spring Cleanup |
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 Mountain Knotweed questions
What zones can White Mountain Knotweed grow in?
White Mountain Knotweed is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is White Mountain Knotweed deer resistant?
Yes — White Mountain Knotweed is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does White Mountain Knotweed bloom?
White Mountain Knotweed typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does White Mountain Knotweed need full sun?
White Mountain Knotweed does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Persicaria to compare
Mountain Fleece Chinese Fleeceflower
Persicaria amplexicaulis
Mountain Fleece 'Firetail'
Persicaria amplexicaulis 'Firetail'
Taurus Mountain Fleece
Persicaria amplexicaulis 'Taurus'
Giant Fleeceflower
Persicaria polymorpha
Common Bistort
Persicaria bistorta 'Superba'
Rosea Mountain Fleece
Persicaria amplexicaulis 'Rosea'
Keep exploring
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Grow White Mountain Knotweed 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.
