Garden Scheme
Plant library · Perennial Flowers
Stokesia laevis
Stokes’ aster is a compact perennial for sunny borders, pollinator plantings, and small drifts. Its fringed lavender-blue daisy flowers carry the display from early through late summer while the 1½-foot scale keeps it visually connected to lower border plants. Use it where a long flowering season is needed without giving over much bed depth.
Space Stokes' Aster 18 inches apart, measured center to center (45 cm).
The mature spread is about 18 inches (45 cm), so neighboring plants just meet at maturity without crowding.
Treat 18 inches as a planning baseline — cultivar and local growing conditions shift the final footprint.
Set Stokes’ aster near the front or middle of a border, with taller perennials or shrubs behind it rather than immediately beside it. A repeated run along a sunny bed edge creates a continuous summer layer, while small groups can punctuate open areas of a pollinator garden. Keep the planting far enough back from a path that flower stems do not lean into the circulation space after heavy rain.[1]
Allow a mature footprint of about 1½ feet wide, and plant on 18-inch centers for a filled-in grouping. In a narrow border, reserve at least 18 inches from the planting center to a wall, edging line, or neighboring plant center so the clumps can meet without being compressed. Use odd-numbered groups or a repeating row when a clearer mass is wanted.
Give this perennial full sun and moderate water, with soil that drains freely. It suits beds that hold even moisture during the growing season but should not occupy a low pocket where winter water lingers. Sandy or loamy planting areas with a raised crown line are easier places to keep open and well drained.[1][2]
The main floral presence is in summer, so pair its position with plants that provide spring structure or later-season interest nearby. The basal foliage can remain present through winter in warmer conditions, leaving a low rosette after flowering stems are finished. Remove spent flowers and stems when a tidier border outline is wanted and to encourage further bloom.[1][2]
Do not use Stokes’ aster as the occupant of a winter-wet swale or poorly drained bed; winter wetness can cause losses. Flower stems may flop after strong rain, so avoid placing a single exposed plant at the clean edge of a formal path. A group set slightly behind sturdier neighbors gives the planting a more forgiving outline.[1][2]