Jacob's Ladder. With its blue bell-shaped flowers, Jacob's ladder ( Polemonium caeruleum) is perfect for your shady garden. If deadheaded, the flowers may rebloom. A native species, P. reptans, is only 12 inches high, making an excellent ground cover in moist, shady areas. 18 to 24 inches tall.. Scientific Name: Commelina dianthifolia. Bird-bill dayflowers are beautiful blue perennial flowers that get its name from the behavior of their own flowers. Each day, the flowers open by sunrise and withers by midday. The flower gives rise to three petals whose shape resembles mouse's ears. Bird-bill dayflowers are very robust.

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Brunnera macrophylla 'Jack Frost'. Brunnera macrophylla 'Jack Frost' makes an unusual addition to a spring garden, and is perfect for brightening shady spots. It flowers in April and May, with lots of small bright blue flowers. The pale silver-grey foliage beautifully complements the delicate flowers.. Lily of the Nile. This summer-blooming flower is popular among southern gardeners. Scientific name: Agapanthus africanus. The lily of the Nile is bright, showy, and alluring, coming in gorgeous shades of blue to blue-purple. These flowers absolutely love the sun and will need 6 to 8 hours of sunlight each day.