Arrowleaf Ragwort (Triangularis)

The Arrowleaf Ragwort (Triangularis) 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 summer and fall . The Arrowleaf Ragwort (Triangularis) has green foliage and inconspicuous yellow flowers, with an abuncance of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the mid summer, with fruit and seed production starting in the fall and continuing until fall. Leaves are not retained year to year. The Arrowleaf Ragwort (Triangularis) has a long life span relative to most other plant species and a moderate growth rate. At maturity, the typical Arrowleaf Ragwort (Triangularis) will reach up to 4 feet high, with a maximum height at 20 years of 0 inches.

The Arrowleaf Ragwort (Triangularis) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed. It has a moderate 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 -33°F. has low tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Moderate
General Type Subshrub, Forb/herb
Growth Period Summer, Fall
Growth Duration Perennial
Lifespan Long
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Mid Summer
Displays Fall Colors No
Shape/Growth Form Rhizomatous
Drought Tolerance Low
Shade Tolerance Intermediate
Height When Mature 4
Vegetative Spread Slow
Flower Color Yellow
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Fall Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Seed
Moisture Requirements High
Cold Stratification Required No
Minimum Temperature -33
Soil Depth for Roots 10
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Slow
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 6.2–7.8 pH
Precipitation Range 14–14 inches/yr
Planting Density 0–0 indiv./acre
Soil Textures Fine, Medium
Soil Depth for Roots 10
Minimum Frost-Free Days 145 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Palatability High
Fire Resistant No
Causes Livestock Bloating None

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