The sun necessity and develop precondition forlobeliaplants change look on the type of lobelia . One of the most unremarkably cultivated diversity , Lobelia inflata , is used as a herbal medicinal appurtenance . In the landscape , Lobelia cardinalis earn a bluff statement with bright violent flower . For a more subtle flowering recurrent soil covering fire , select the blue - blossom Lobelia erinus . Lobelia siphilitica has delicate gamy flowers but provides more height than the low - growing Lobelia erinus .

Lobelia inflata

Lobelia inflata is an yearbook that grows well in corpse soil , gain it ideal for areas with heavy soil . The plant is various , thriving in both full sun and partial or dappled shade . It grows 1 foot tall and blooms in mid to tardy summer . As a medicinal herb , Lobelia inflata is cultivated for household use and grown commercially . Though technically an annual , this lobelia sometimes grows as a biennial , according to Plants for a Future .

Lobelia cardinalis

Lobelia cardinalis is a perennial lobelia variety that spring up 2 to 4 feet tall in an vertical pattern . The bright red flowers bloom from mid to late summer , creating a dab of vibrant color in the recurrent flower bed . A spot in full sun or light shade restrain this bloom repeated growing vigorously , provided there is enough water supply . Lobelia cardinalis requires consistently break soil to thrive . The Missouri Botanical Garden gave this plant one of its ' Plant of Merit ' accolade as a landscape painting perennial .

Lobelia erinus

Lobelia erinus grows just 1/2 to 3/4 metrical foot magniloquent , making it an ideal flat coat cover in a repeated flush bottom or shrub layer . Like other lobelia mixed bag , this plant enjoys full sunlight or fond shade . It is not worthy as a ground cover for deep shadowiness areas . The flower are usually blue , though some different cultivar display a variety of flower colors , including purple , violet , white and violent , accord to the Missouri Botanical Garden . Flowers start blooming in springiness and continue until the warmth of the summer solidifying in .

Lobelia siphilitica

Lobelia siphilitica creates height in the garden , growing 2 to 3 pes tall . A billet in the sun case this lobelia well , though a dappled shade surface area is also tolerate . The blue heyday peak between July and September . Plant Lobelia siphilitica in damp or boggy territory where it will remain consistently damp . This efflorescence perennial is ideal for water gardens and the shallow edge around pond and other water feature .

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