Manyspike Flatsedge (Polystachyos)

The Manyspike Flatsedge (Polystachyos) is generally described as a perennial graminoid. This is native to the U.S. (United States) has its most active growth period in the spring and fall . The greatest bloom is usually observed in the mid summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Manyspike Flatsedge (Polystachyos) has a short life span relative to most other plant species and a moderate growth rate. At maturity, the typical Manyspike Flatsedge (Polystachyos) will reach up to 1.6 foot high, with a maximum height at 20 years of 0 inches.

The Manyspike Flatsedge (Polystachyos) is not commonly available from nurseries, garden stores and other plant dealers and distributors. It can be propagated by sprigs. It has a moderate ability to spread through seed production and the seedlings have low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 47°F. has low tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Moderate
General Type Graminoid
Growth Period Spring, Fall
Growth Duration Annual, Perennial
Lifespan Short
Plant Nativity Native to U.S.
Commercial Availability No Known Source
Physical Characteristics
Bloom Period Mid Summer
Displays Fall Colors No
Shape/Growth Form Bunch
Drought Tolerance Low
Shade Tolerance Intolerant
Height When Mature 1.6
Vegetative Spread None
Flower Color Green
Flower Conspicuousness No
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Sprigs
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 47
Soil Depth for Roots 8
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 4.5–6.5 pH
Precipitation Range 32–32 inches/yr
Planting Density 3450–4800 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 8
Minimum Frost-Free Days 100 day(s)
Salinity Tolerance Low
CaCO3 Tolerance Low
Sustainability & Use
Leaf Retention No
Fire Resistant No
Causes Livestock Bloating None

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