Yes, though the list is shorter than most gardeners hope. The plants that work as blue flowers for shade are woodland species that grew up under a canopy, rather than sun-lovers you push into a dark corner and hope for the best. Siberian bugloss, Virginia bluebells and woodland phlox show up on almost every guide that answers this question. They show up because that is where they already live, so you get flowers instead of thin, sulking stems.
The damp strip under our old apple tree carries more blue each April than the sunny border ever has. I planted Siberian bugloss along the drip line, and Virginia bluebells came up through it the next spring without any help from me. Both plants sit on the shade lists in gardening guides and not on the full sun ones. I tried a salvia there first. It gave me two thin stems and quit.
Shade is not one condition, and that is where most of your trouble will start. Light shade under a deciduous tree gives you bare bright weeks in spring, dapple through summer, then open sky again in fall. Dense evergreen shade gives you the same low light every month of the year. A plant that does well for you under an old oak can sit and do nothing under a spruce. The ground under conifers is often dry on top of being dark, so your watering has to keep up.
Spring bulbs win on timing instead of shade tolerance. Siberian squill, glory-of-the-snow and grape hyacinth flower before deciduous canopies close over. They take a few weeks of near full sun, then finish before the leaves shut the light down. Put them under an evergreen and the trick stops working for you. Worth knowing before you order a hundred bulbs for a corner that never brightens.
For shade blue perennials that hold a spot year after year, the ranking guides keep landing on the same five names. Treat the zone, height and bloom dates printed in nursery catalogs as typical ranges rather than tested numbers, because that is what they are. I have never seen a measured light figure for any of them, just catalog copy that says part shade and leaves it there. If you plant one thing, make it Siberian bugloss.
Blue is a rare color to start with. A 2021 paper in Frontiers in Plant Science put flowers that people see as blue at under 10% of the roughly 300,000 known flowering plants. The shade-tolerant slice of that is a short list by nature, so you should not expect a wall of choices at the garden center. Nurseries file most of these under blue flowers part shade rather than deep shade, and that is a fair account of what you can ask of them.
Blue leaves are a separate lever you can pull. Some blue plant lists include blue fescue and blue hosta, but those entries are about leaf color and say nothing about how much shade the plant wants. Check the light needs of a blue-leaved plant on its own terms before you slot it under a tree, or you end up with a sun grass sitting in the dark.
Sit with the spot before you buy anything. Check it at nine in the morning and again at four, and write down what you find both times. A corner that looks dark at breakfast can still take two hours of hard afternoon sun. Then send your soil and moisture questions to a regional extension guide instead of a national plant list. Woodland blue flowers want the conditions of a woodland floor, and your county service knows what damp, leafy shade looks like where you live.
Read the full article: 10 True Blue Flowers and Why Blue Is Rare
