Wimmera Ryegrass (Rigidum)

The Wimmera Ryegrass (Rigidum) is generally described as an annual graminoid. This is not native to the U.S. (United States) and has its most active growth period in the fall and winter and spring . The greatest bloom is usually observed in the early spring, with fruit and seed production starting in the spring and continuing until spring. Leaves are not retained year to year. The Wimmera Ryegrass (Rigidum) has a short life span relative to most other plant species and a rapid growth rate. At maturity, the typical Wimmera Ryegrass (Rigidum) will reach up to 3.5 feet high, with a maximum height at 20 years of 0 inches.

The Wimmera Ryegrass (Rigidum) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed. It has a slow ability to spread through seed production and the seedlings have high vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 12°F. has low tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Rapid
General Type Graminoid
Growth Period Fall, Winter, Spring
Growth Duration Annual
Lifespan Short
Plant Nativity Introduced to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Early Spring
Displays Fall Colors No
Shape/Growth Form Bunch
Drought Tolerance Low
Shade Tolerance Intolerant
Height When Mature 3.5
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness No
Fruit/Seed Abundance High
Fruit/Seed Seasonality Spring Spring
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Seed
Moisture Requirements High
Cold Stratification Required No
Minimum Temperature 12
Soil Depth for Roots 10
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Rapid
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5.5–7.5 pH
Precipitation Range 15–15 inches/yr
Planting Density 0–0 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 10
Minimum Frost-Free Days 200 day(s)
Salinity Tolerance High
CaCO3 Tolerance Medium
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