Special Web Offer - Get 50% OFF!
Grab Your Deal Now
PlantSnap
Plant Care
Curlytop knotweed
(Persicaria lapathifolia)
Also Known As
Curlytop knotweed, Dock-leaved smartweed, Large-leaved smartweed, Bitter smartweed
About This Plant
Persicaria lapathifolia is a herbaceous plant that belongs to the Polygonaceae family. It is also known as Pale Smartweed, Nodding Smartweed or Curlytop Knotweed. The plant has a long, slender stem with green leaves and small pink or white flowers that bloom in the summer.
Plant Care Instructions
Outdoor Size Range
24-36 inches (60-90 cm)
Light Requirements
Pale Smartweed prefers full sun to partial shade. It can tolerate some shade but will not grow as well.
Humidity Needs
Persicaria lapathifolia prefers moderate to high humidity levels.
Fertilizing Schedule
The plant does not require much fertilizer but can benefit from a balanced, slow-release fertilizer in the spring.
Pruning Guidelines
The plant does not require much pruning. Deadheading spent flowers can encourage more blooms.
Common Pests and Diseases
Persicaria lapathifolia is relatively pest-free, but can be susceptible to fungal diseases like powdery mildew.
Indoor Size Range
6-12 inches (15-30 cm)
Watering Schedule
The plant prefers moist soil and can tolerate wet soil. It should be watered regularly, especially during dry spells.
Temperature Range
The plant can tolerate a wide range of temperatures, from 40 to 90 degrees Fahrenheit (4 to 32 degrees Celsius).
Growing Season
The growing season for Persicaria lapathifolia is from late spring to early fall.
Growing Difficulty Level
Pale Smartweed is relatively easy to grow, making it a good choice for beginner gardeners.
USDA Hardiness Zones
Persicaria lapathifolia is hardy in USDA zones 5-9.
Did You Know?
The plant is sometimes used in herbal medicine to treat digestive and respiratory issues.
