Mammoth Wildrye (Racemosus)

The Mammoth Wildrye (Racemosus) is generally described as a perennial graminoid. This is not native to the U.S. (United States) and has its most active growth period in the spring and summer . The greatest bloom is usually observed in the late spring, with fruit and seed production starting in the summer and continuing until summer. Leaves are not retained year to year. The Mammoth Wildrye (Racemosus) has a moderate life span relative to most other plant species and a rapid growth rate. At maturity, the typical Mammoth Wildrye (Racemosus) will reach up to 3 feet high, with a maximum height at 20 years of 0 inches.

The Mammoth Wildrye (Racemosus) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed, sprigs. 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 -33°F. has high tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Rapid
General Type Graminoid
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Introduced to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Late Spring
Displays Fall Colors No
Shape/Growth Form Rhizomatous
Drought Tolerance High
Shade Tolerance Intolerant
Height When Mature 3
Vegetative Spread Rapid
Flower Color Yellow
Flower Conspicuousness No
Fruit/Seed Abundance High
Fruit/Seed Seasonality Summer Summer
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Seed, Sprigs
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature -33
Soil Depth for Roots 16
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 6–9 pH
Precipitation Range 10–10 inches/yr
Planting Density 3000–11000 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 16
Minimum Frost-Free Days 120 day(s)
Salinity Tolerance Low
CaCO3 Tolerance High
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