Thalictrum aquilegiifolium aka French Meadow Rue

Thalictrum aquilegiifolium is a perennial in the buttercup family. Gardeners call it meadow rue or columbine meadow rue. Its native range runs from Europe across Asia to Japan. It grows in damp woods, hedges, and rich upland meadows. Some wild sites lie on stony ground near Alpine glaciers. It is not native to Britain or Ireland. Its leaves resemble columbine leaves, but it is a different plant.

Garden plants often reach 2–3 feet (0.6–0.91 metres) tall and wide. RHS gives a taller limit of 4.9 feet (1.5 metres). Its spread estimate is smaller, at 0.3–1.6 feet (0.1–0.5 metres). The plant forms an upright, open clump with blue-green leaves. These compound leaves have lobed parts and a smooth surface. They cluster at the base and give a fine-textured look. The plant loses its leaves each year. Slender, branched stems hold the flowers above the leaf clump. These stems seldom need stakes or other support.

Flowers appear from May to July, spanning late spring and early summer. Dense panicles carry pink, pale purple, or white blooms. Male and female flowers grow on separate plants. Male blooms make the stronger display, thanks to many purple stamens. These stamens give the flower clusters their soft, fluffy look. The blooms attract butterflies and suit cutting for indoor use. Cream to tan clusters of winged seeds follow the flowers. They add interest after the main bloom and into fall.

Grow meadow rue in moist soil that drains well. It prefers rich soil with humus and some shade. Full sun also suits it where summer conditions allow. Dappled afternoon light fits its needs in warmer sites. Hot, humid summers can cause poor growth. Sources list USDA zones 5–8 and UK hardiness H5. Use it in borders, meadows, wildflower gardens, or large pots. Its leaves and flowers also suit cottage and courtyard gardens.

Care needs are low, and serious pest problems are uncommon. Deer and rabbits tend to leave the plant alone. Slugs may attack it, and dry conditions can bring powdery mildew. Remove faded flowers, and divide plants as spring growth starts. Divisions may take time to settle; seed offers another route. PFAF records food uses for roots and young leaves. It also warns that the whole plant is poisonous. The root carries a stronger warning, so these uses do not establish safety.