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Lobelia erinus (edging lobelia, garden lobelia or trailing lobelia) is a species of flowering plant in the bellflower family Campanulaceae, native to southern Africa.
It is a low growing, prostrate or scrambling herbaceous perennial plant growing to 8–15 cm tall. The basal leaves are oval, 10 mm long and 4–8 mm broad, with a toothed margin; leaves higher on the stems are slender and sometimes untoothed.
The flowers are blue to violet in wild plants, with a five-lobed corolla 8–20 mm across; they are produced in loose panicles. About 0.5 to 4.5 inches long inflorescence stems are about 5 inches long, loose racemose inflorescences with many flowers. The hermaphrodite flower is zygomorphic with a length of up to 1 centimeter and quinate with double perianth. The five sepals are fused. The fan-shaped lower lip is trilobed. The color of the crown varies depending on the variety between white, blue, purple, pink or red and the center is yellow or white. The five stamens are 3 to 7 millimeters long.
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The fruit is a 5–8 mm capsule containing numerous small seeds.
The distribution area lies in southern Africa and extends from Malawi, Mozambique, Zambia and Zimbabwe to the south to Botswana, Namibia, Eswatini, Lesotho and the South African provinces. L. erinus also occurs as a weed where it has escaped from cultivation.
Lobelia erinus is a very popular edging plant in gardens, especially for hanging baskets and window boxes. In temperate zones it is grown as a half-hardy annual, i.e. sown under glass with some heat in spring, then planted out when all danger of frost has passed. Alternatively plants can be purchased from garden centres as young "plug" plants, to be transferred outside in May or June.
