Senna Species, Twin-Leaf Senna, Two-Leaf Senna
Sennaroemeriana

Synonym:Cassia roemeriana

Category
Perennials

Water Requirements
Drought-tolerant; suitable for xeriscaping

Sun Exposure
Sun to Partial Shade

Foliage
Herbaceous
Smooth

Foliage Color

Height
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

Spacing
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

Hardiness
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)

Where to Grow

Danger
Parts of plant are poisonous if ingested

Bloom Color
Gold (yellow-orange)
Bright Yellow

Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds

Bloom Size

Bloom Time
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Other details

Soil pH requirements
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)
7.9 to 8.5 (alkaline)

Patent Information
Non-patented

Propagation Methods
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting
Allow pods to dry on plant; break open to collect seeds