Add a refined vertical accent with Thalictrum rochebrunianum (meadow rue), a tall, see-through perennial prized for its delicate, ferny foliage and floating, mist-like clusters of lavender flowers in midsummer. You get height without heaviness, so it can rise through a mixed border without blocking what is behind it.
Plant it where the soil stays evenly moist and enriched with organic matter. Part shade to shade is ideal, especially in warmer climates; it can take more sun if the root zone never dries out. A sheltered site also helps protect its lofty stems from wind. Provide room for a mature clump and keep the crown level with the surrounding soil when planting.
As it grows, you may want to add discreet staking or tuck it among sturdy neighbors for support, particularly in rich soils where it can grow taller. Water during dry spells, mulch to moderate soil moisture, and avoid letting it bake in hot, dry conditions. After flowering, you can leave stems standing for structure or cut back to tidy the planting.
This meadow rue is a strong choice for woodland edges, shade borders, and mixed perennial plantings where you want a soft, airy look. It is often avoided by deer and rabbits and is also a welcome addition for butterflies in summer.