Bacopa caroliniana

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Blue Waterhyssop, Lemon Hyssop


Plant Specifics

Size:0.25 - 0.5 ft tall by extensive mats ft wide
Life Span:Short-lived perennial
Flower Color:Blue
Fruit Color:NA
Phenology:Winter dormant
Noted for:Showy flowers


Recommended Uses:Spreading ground cover around the edges of retention ponds and aquatic gardens. Groundcover in restoration areas. Also used in aquariums.
Propagation:Easily roots from division or stem cuttings.
Availability:Native nurseries
Light: Full Sun
Moisture Tolerance:
always floodedextremely dry
 (Aquatic ----- to ----- Aquatic)
Moisture Tolerance: Aquatic ----- to ----- Aquatic
Salt Water Flooding Tolerance:Not salt tolerant of inundation by salty or brackish water.
Salt Spray/ Salty Soil Tolerance:Low/no tolerance of salty wind or direct salt spray
Soil or other substrate:Sand
Soil pH:Broadly tolerant, prefers some organics



Larval host plant for white peacock (Anartia jatrophae) butterflies. Insect pollinated.

Native Habitats:Marshes, swamps, ditches

Distribution and Planting Zones

Natural Range in Florida
USDA Zones

Suitable to grow in:
10A 10B 8A 8B 9A 9B 

USDA zones are based on minimum winter temperatures


Ethnobotany:Over the centuries, this plant has been used in religious and medical contexts. The plant has a broad distribution including a long history of ethnobotanical uses in India, leading to the suspicion that it may not be native to North America.
General Comments:Lemon bacopa is distinguished by blue flowers, a hairy upper stem, and by the lemony scent of its crushed foliage.