Sulphur-flower Buckwheat (Umbellatum)

The Sulphur-flower Buckwheat (Umbellatum) is generally described as a perennial subshrub or shrub or forb/herb. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The Sulphur-flower Buckwheat (Umbellatum) has gray-green foliage and inconspicuous yellow flowers, with a moderate amount 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 fall. Leaves are not retained year to year. The Sulphur-flower Buckwheat (Umbellatum) has a long life span relative to most other plant species and a slow growth rate. At maturity, the typical Sulphur-flower Buckwheat (Umbellatum) will reach up to 1 foot high, with a maximum height at 20 years of 1 foot.

The Sulphur-flower Buckwheat (Umbellatum) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by bare root, container, 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 7°F. has high tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Slow
General Type Subshrub, Shrub, Forb/herb
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Long
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Early Summer
Displays Fall Colors No
Shape/Growth Form Multiple Stem
Drought Tolerance High
Shade Tolerance Intolerant
Height When Mature 1
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness Yes
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Low
Cold Stratification Required No
Minimum Temperature 7
Soil Depth for Roots 20
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing No
Growth Requirements
pH Range 6.5–9 pH
Precipitation Range 8–8 inches/yr
Planting Density 1212–4850 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 20
Minimum Frost-Free Days 140 day(s)
Salinity Tolerance High
CaCO3 Tolerance High
Sustainability & Use
Leaf Retention No
Palatability Medium
Fire Resistant No
Causes Livestock Bloating None

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