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Writer's picturerobertw

Gardening Tips: Cardinal Flowers, Both Red and Blue



Image of red lobelia flowers

As summer changes to fall my mind is on my garden--and a few more gardening tips...


Labor Day has passed and suddenly Hannaford is once again a peaceful place to shop. Not only has the number of cars racing by the house dropped, but the traffic in our Pondside garden has slowed. Gone are the numerous ruby-throated hummingbirds that have been fattening themselves with pollen, to be ready for the journey south. For the last month their busy wings have been shaking the foliage of Cardinal Flowers, both red (Lobelia cardinalis) and blue (L. siphilitica) as their long tongues licked out the pollen

deep within tubular flowers. Cardinal Flowers are ornithophilous, meaning they have

evolved to be pollenated by birds only, not insects. So, if you have these stunning

perennials in your garden, you are sure to attract hummingbirds.


Both Lobelias, native to Maine, are very picky about their growing conditions and

therefore are not widespread. They prefer rich soil, which is constantly moist throughout

the growing season, even surviving inundation that would rot other plants. Full to part

sun is required for spiky stems to reach a height of 5-6’. Although short lived, they

readily self-seed with each plant producing thousands of seeds. Deadheading will

Image of red and blue lobelia flowers

increase the number of flowers on each plant but will also reduce seed production. In proper conditions, Lobelia will colonize quickly from seed and sending out runners.

The common name Cardinal Flower came from the similarity of the brilliant red

flower color to the red robes worn by Catholic Cardinals, not, as some believe, by comparison to our own Northern Cardinal bird.


Although all parts of the plants are toxic to humans and pets, there is a history of

its medicinal use by Native Americans. An infusion of leaves was used to relieve fever

sores, cramps and upset stomachs, as well as typhoid and sterility. The Great Blue form

gained its name “siphilitica” because it could be prescribed to treat, you guessed it,

syphilis.


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