singlewhorl burrobrush
Hymenoclea monogyra · Asteraceae
singlewhorl burrobrush (Hymenoclea monogyra) is a perennial shrub in the Asteraceae family. It is native to North America. USDA records it as hardy in zone 9 and warmer, down to about 27°F.
At a glance
| Type | shrub USDA |
|---|---|
| Lifecycle | perennial USDA |
| Native status | native USDA |
| Mature height | 2 ft USDA |
| Soil pH | 6.1–7.9 USDA |
| Bloom | March–May USDA |
| Flower color | White USDA |
| Hardiness zones | 9 and warmer USDA |
| Guild layer | shrub Derived |
USDA quoted from the USDA PLANTS database · Derived computed by a fixed rule from those columns. No value on this page is estimated.
Growing conditions
Its drought tolerance is rated high. It handles periodically wet ground (USDA rates its anaerobic tolerance medium). It is recorded on soils from pH 6.1 to 7.9 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 9.
Size and growth
At maturity it reaches about 2 ft, making it about knee height.
Bloom period
USDA records a bloom period of March through May. Flowers are white.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is green, coarse in texture. Its flowers are not conspicuous — a plant for form and foliage. USDA rates its lifespan as short, so plan on replacing or resowing it rather than treating it as permanent structure.
What the site needs to provide
USDA records it across sites receiving 4 to 80 inches of annual precipitation. The low end of that band is genuinely arid, so it has a wide tolerance for dry country. It needs at least 207 frost-free days to finish its season. It roots to at least 12 inches.
Propagating it
Its seed spreads at a moderate rate.
Resilience and wildlife
Its fire tolerance is rated medium.
Role in a guild
Shrub layer. In a layered planting this is woody mid-level structure between the understory and the ground. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol HYMO, or is computed from those values by a fixed rule. Nothing here is estimated or model-generated. Where USDA publishes no value, this page omits the claim rather than filling the gap.
- Quoted from USDA PLANTS: Bloom, Bloom end, cold stratification, Drought tolerance, fall conspicuous, fire tolerance, Flower color, flower conspicuous, foliage color, foliage texture, frost free days min, fruit conspicuous, Hardiness zones, Lifecycle, lifespan, Mature height, Minimum temperature, Native status, Nitrogen fixation, precipitation max in, precipitation min in, resprout ability, root depth in, seed spread rate, Soil pH, Soil pH (upper), Tolerance of wet soil, Type.
- Derived by a fixed rule from those columns: Guild layer.
Read our full data sources and methodology.
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