Davis' Knotweed (Davisiae)

The Davis' Knotweed (Davisiae) is generally described as a perennial subshrub or forb/herb. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The Davis' Knotweed (Davisiae) has green foliage and inconspicuous purple flowers, with a smattering of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the early summer, with fruit and seed production starting in the summer and continuing until summer. Leaves are not retained year to year. The Davis' Knotweed (Davisiae) has a moderate life span relative to most other plant species and a moderate growth rate. At maturity, the typical Davis' Knotweed (Davisiae) will reach up to 1.3 foot high, with a maximum height at 20 years of 0 inches.

The Davis' Knotweed (Davisiae) is not commonly available from nurseries, garden stores and other plant dealers and distributors. It can be propagated by container, cuttings, seed. It has a slow ability to spread through seed production and the seedlings have medium vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -23°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Moderate
General Type Subshrub, Forb/herb
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Native to U.S.
Commercial Availability No Known Source
Physical Characteristics
Bloom Period Early Summer
Displays Fall Colors No
Shape/Growth Form Single Crown
Drought Tolerance Medium
Shade Tolerance Intermediate
Height When Mature 1.3
Vegetative Spread None
Flower Color Purple
Flower Conspicuousness Yes
Fruit/Seed Abundance Low
Fruit/Seed Seasonality Summer Summer
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Container, Cuttings, Seed
Moisture Requirements Low
Cold Stratification Required No
Minimum Temperature -23
Soil Depth for Roots 14
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate None
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 6.4–7.8 pH
Precipitation Range 14–14 inches/yr
Planting Density 1700–2700 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 14
Minimum Frost-Free Days 120 day(s)
Salinity Tolerance None
CaCO3 Tolerance Low
Sustainability & Use
Leaf Retention No
Palatability Low
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA