American bellflower
Campanulastrum americanum · Campanulaceae
American bellflower (Campanulastrum americanum) is a annual herbaceous plant in the Campanulaceae family. It is native to North America. USDA records it as hardy in zone 12 and warmer, down to about 52°F.
At a glance
| Type | forb-herb USDA |
|---|---|
| Lifecycle | annual USDA |
| Native status | native USDA |
| Mature height | 6 ft USDA |
| Light | shade USDA |
| Water need | medium USDA |
| Growth rate | rapid USDA |
| Soil pH | 5.5–7.5 USDA |
| Bloom | June–August USDA |
| Flower color | Blue USDA |
| Hardiness zones | 12 and warmer USDA |
| Guild layer | herb-layer Derived |
| Nursery availability | Contracting Only 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 tolerates full shade. USDA rates it as having moderate water needs. Its drought tolerance is rated low. It handles periodically wet ground (USDA rates its anaerobic tolerance medium). It is recorded on soils from pH 5.5 to 7.5 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 12.
Size and growth
At maturity it reaches about 6 ft, making it a plant that will finish above head height. It grows quickly.
Bloom period
USDA records a bloom period of June through August. Flowers are blue.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is green, medium in texture. Its flowers are conspicuous. Its active growth period is spring, summer, fall.
What the site needs to provide
USDA records it across sites receiving 30 to 60 inches of annual precipitation. It needs at least 160 frost-free days to finish its season. It roots to at least 8 inches. Fertility requirement: medium.
Propagating it
Propagate it from seed and container stock. USDA records no cold-stratification requirement, so seed should germinate without a chilling period. Its seed spreads at a slow rate. It does not spread vegetatively, so it will stay where you put it.
Resilience and wildlife
Its fire tolerance is rated none. Its growth form is recorded as single crown.
Role in a guild
Herb layer. In a layered planting this is the herbaceous middle — perennials and grasses that fill the space between ground cover and shrubs. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Similar role and hardiness
- bearded beggarticks Bidens aristosa
- crowned beggarticks Bidens coronata
- smooth beggartick Bidens laevis
- golden tickseed Coreopsis tinctoria
- marshpepper knotweed Polygonum hydropiper
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol CAAM18, 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, 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, Type, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer.
Read our full data sources and methodology.
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