Shrub
Senna
Senna
Varieties We Carry
PrivetSenna ligustrinaStandardSennaPopcornSenna didymobotrya
Sizes & Pricing
1 galFrom$7.95
2 galFrom$14.95
3 galFrom$14.95
7 galFrom$54.95
15 galFrom$165.00
Fresh this week. Last restocked Mar 11.
LightFull Sun
WaterLow to Moderate
Mature size4-20 feet × 4-15 feet
About Senna
Cassia or Senna (Senna spp.) is a genus of tropical shrubs and small trees in the legume family, known for their profuse clusters of bright yellow five-petaled flowers and attractive pinnate foliage. Many species are native to the Americas and are important larval host plants for sulphur butterflies. Starting at $7.95.
Plant details
- Bloom Season
- Fall, Winter (peak Oct–Jan in NE FL; some species nearly year-round)
- Flower Color
- Yellow
- Growth Rate
- Fast
- Foliage
- Evergreen
- Soil
- Sandy, Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
Good planting window.
Bloom season.
Bloom season. Ideal planting window.
Retains foliage through winter.
Care essentials
Light
Plant Senna in full sun for best flowering; it is well-adapted to Northeast Florida's heat and requires at least 6 hours of direct sun daily.
Water
Drought-tolerant once established; water during dry spells in the first season to establish deep roots. Mature plants rarely need supplemental irrigation in NE Florida's summer rainfall pattern.
Soil & Fertilizer
Adaptable to sandy or loamy, well-drained soils typical of Northeast Florida; tolerates poor fertility. Fertilize lightly in spring with a balanced slow-release fertilizer. If frosted back, cut stems to the ground — vigorous regrowth will follow in spring.
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Common questions
Is Senna a good plant for St. Augustine?
Senna is a shrub for Zone 9b coastal Florida gardens, with medium salt tolerance, reaching 4-20 feet × 4-15 feet.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.