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Great Blue Lobelia

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Hardy Planting Zones- 4-9 Sun or Shade – Sun and Part Shade Mature Height - 24-36" Mature Width- 12-16" Bloom Season – Summer (July to September) Gardener Status- Beginner Soil Type- Loam/Sand/Clay.

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Here's how your plants will look on arrival. All plants are dormant with no leaves or foliage.

Great Blue Lobelia - Lobelia Siphilitica


The Great Blue Lobelia is also known as the Blue Cardinal Flower. It's a perennial plant that mainly grows in eastern and central Canada and the United States. The most common time to see them is in late summer and early fall. The months are usually from August to October. Regarding lifespan, each plant usually only lives for a few years. It's most common in Illinois, besides some of the southern counties. In the state, you'll usually find them in some of the following areas: black soil prairies, wet meadows that are near rivers, low areas that are next to ponds and rivers, floodplains, bottomland woodlands, at the bottom of sandstone canyons next to streams, swamps, pastures, and ditches. This plant is in the Bellflower family and can be from 1" to 4" tall. The stem is a nice green, while the flowers are usually a bluish purple color. The flowers can be for 1" to 1 1/2" long and are angled upwards. The best way to grow these plants it in wet to moist soil with partial sunlight. With that being said, if the soil is always moist, then full sunlight can be tolerated. You want to ensure you grow it in fertile soil that is loamy. This will give it the best chance of growing to its full potential. This plant can also handle some flooding but can become muddy and look ragged if it gets too much. One thing to keep in mind is that the seeds need sunlight to germinate. If it doesn't have sunlight, then it won't take off, and you won't be able to grow it. The nectar in the flowers usually attract bumblebees and other bees that have long tongues. Some other creatures visit even though they aren't as common. The most common of these are the Ruby-Throated Hummingbird and large butterflies. On the other hand, herbivores don't usually eat the foliage because they contain toxins that are dangerous and poisonous.


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Blue Lobelia is an attractive non-branching perennial which features a gorgeous bluish, tube-shaped crowd of flowers on its upper stem. It makes an exceptional and hearty addition to woodland garden projects and blooms in late summer. A member of the Bellflower family, the Blue Lobelia is an unusual flower characterized by its split design. The upper section of the flower is divided into two segments while the lower has three. This makes for an interesting visual amongst more traditional garden vegetation.