downy paintedcup
Castilleja sessiliflora · Scrophulariaceae
downy paintedcup (Castilleja sessiliflora) is a perennial herbaceous plant in the Scrophulariaceae family. It is native to North America. USDA records it as hardy in zone 3 and warmer, down to about -38°F.
At a glance
| Type | forb-herb Derived |
|---|---|
| Lifecycle | perennial USDA |
| Native status | native USDA |
| Mature height | 1.3 ft USDA |
| Light | full-sun USDA |
| Water need | low USDA |
| Growth rate | moderate USDA |
| Soil pH | 6–7.4 USDA |
| Bloom | April–May USDA |
| Flower color | Yellow USDA |
| Hardiness zones | 3 and warmer USDA |
| Guild layer | ground-cover Derived |
| Nursery availability | Routinely Available USDA |
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
It needs full sun. USDA rates it as having low water needs once established. Its drought tolerance is rated high. It will not tolerate waterlogged soil — USDA rates its anaerobic tolerance as none. It is recorded on soils from pH 6 to 7.4 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 3.
Size and growth
At maturity it reaches about 1.3 ft, making it a low, mat-forming plant. It grows at a moderate rate.
Bloom period
USDA records a bloom period of April through May. Flowers are yellow.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is yellow-green, coarse in texture. Its flowers are conspicuous. Its active growth period is spring and summer. USDA rates its lifespan as long.
What the site needs to provide
USDA records it across sites receiving 16 to 32 inches of annual precipitation. It needs at least 120 frost-free days to finish its season. It roots to at least 10 inches. Fertility requirement: low — no feeding needed on ordinary garden soil.
Propagating it
Seed is the only propagation method USDA lists. Division and cuttings are not listed as options. USDA records no cold-stratification requirement, so seed should germinate without a chilling period. Its seed spreads at a moderate rate. It does not spread vegetatively, so it will stay where you put it.
Resilience and wildlife
Its fire tolerance is rated medium. Its growth form is recorded as single crown.
Role in a guild
Ground cover. In a layered planting this is the lowest layer — it shades soil, holds moisture, and suppresses weeds. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Others in Castilleja
- northwestern Indian paintbrush Castilleja angustifolia
- wavyleaf Indian paintbrush Castilleja applegatei
- scarlet Indian paintbrush Castilleja coccinea
- harsh Indian paintbrush Castilleja hispida
Similar role and hardiness
- Canadian milkvetch Astragalus canadensis
- buffalograss Bouteloua dactyloides
- mountain sedge Carex scopulorum
- analogue sedge Carex simulata
- little green sedge Carex viridula
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol CASE5, 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: active growth period, Bloom, Bloom end, cold stratification, Drought tolerance, fall conspicuous, fertility requirement, fire tolerance, Flower color, flower conspicuous, foliage color, foliage porosity winter, foliage texture, frost free days min, fruit conspicuous, growth form, Growth rate, Hardiness zones, Lifecycle, lifespan, Light, Mature height, Minimum temperature, Native status, Nitrogen fixation, Nursery availability, precipitation max in, precipitation min in, propagation, resprout ability, root depth in, seed spread rate, Soil pH, Soil pH (upper), Tolerance of wet soil, Toxicity, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer, Type.
Read our full data sources and methodology.
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