Tansy-leaved phacelia ( Phacelia tanacetifolia ) is an annual native to the southwestern United States, long used in ecological gardens as a green manure and bee-friendly plant. Its finely cut foliage resembles that of tansy, hence its French name, and quickly forms a light carpet that covers the ground in a soft green.

Over the weeks, its upright stems become covered in clusters of lavender-blue, crosier-shaped flowers, which are very popular with bees and many other pollinators. In a harmonious vegetable garden, it plays the role of a discreet but effective companion: it protects bare soil, contributes to soil structure, and attracts beneficial wildlife. Its presence fits naturally into a gardening approach that is both productive and respectful of living things.