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Broad-leaved Caltha, Broad-leaved Marshmarigold, Howell's Marsh Marigold, Marshmarigold, Twinflowere

Calthaleptosepala subsp. howellii

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Family
Ranunculaceae (ra-nun-kew-LAY-see-ee)
Info
Genus
Caltha (KAL-tha)
Info
Synonym
Caltha biflora
Caltha biflora subsp. howellii
Caltha biflora var. rotundifolia
Caltha howellii
Caltha leptosepala subsp. biflora
Sun Exposure
Full Sun
Sun to Partial Shade
Light Shade
Foliage
Herbaceous
Textured
Height
under 6 in. (15 cm)
Spacing
6-9 in. (15-22 cm)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
Danger
Parts of plant are poisonous if ingested
Bloom Color
White/Near White
Bloom Time
Mid Spring
Late Spring/Early Summer
Other Details
Category
Alpines and Rock Gardens
Perennials
Ponds and Aquatics
Water Requirements
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens
Foliage Color

Unknown - Tell us

Where to Grow

Unknown - Tell us

Bloom Characteristics

Unknown - Tell us

Bloom Size

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Other details

Unknown - Tell us

Soil pH requirements
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information

Unknown - Tell us

Propagation Methods
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; stratify if sowing indoors
Seed Collecting
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds
Regional
View this plant in a garden
2 members have or want this plant for trade

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