Stokesia laevis is a perennial in the daisy family that forms compact clumps bearing daisy-like flowerheads from July to September. Flower colours are most often blue or purple, with white forms and a range of cultivated colours also available. It originates from the southeastern United States and favours well-drained loamy or sandy soils. Plants perform best in full sun or light shade and are classed as hardy (H5) in the UK.

Stokes' aster (Stokesia laevis) produces daisy-like flowers from July to September and suits well-drained soils in sun or partial shade.

https://en.wikipedia.org/wiki/Stokesia_laevis

Stokesia laevis

Stokes' aster (Stokesia laevis) | Blue summer blooms

Stokesia laevis 'Alba' is a perennial in the daisy family that carries white summer flower heads from July to September. It suits a sunny position but will tolerate some light shade and prefers well-drained loamy or sandy soil with neutral to slightly acidic pH. Rated H5, it is hardy in much of the UK when planted in a free-draining site. The flowers are produced on stems above the foliage and work well for cutting.

Stokes' aster 'Alba' (Stokesia laevis 'Alba') is a hardy H5 perennial with white flower heads that bloom July to September in well-drained soil.

Stokesia laevis 'Alba'

Stokes' aster 'Alba' (Stokesia laevis 'Alba') | Summer white

Stokesia laevis 'Amethyst' is a bushy, herbaceous perennial cultivar within the Stokesia genus, known for forming evergreen rosettes at its base. It produces vibrant flowers resembling cornflowers, which bloom from spring through summer and are suitable for cutting. This cultivar thrives in full sun with a sheltered aspect, preferring moist but well-drained loam or sandy soils that are acid to neutral in pH. Hardy to UK zone H4, it is well suited to cottage and informal gardens, patios, containers, wildlife gardens, and flower borders.

Stokesia laevis 'Amethyst' is a hardy herbaceous perennial with evergreen rosettes and vibrant cornflower-like blooms from spring to summer.

Stokesia laevis 'Amethyst'

Stokesia laevis 'Blue Star' is a perennial in the daisy family Asteraceae, valued for its summer flower display from July to September. It originates from the southeastern United States and performs best in full sun or partial shade. Plant in well-drained sandy or loamy soils that are acidic to neutral and kept moist but not waterlogged. Suited to borders, rock gardens and containers where drainage can be controlled.

Stokes' aster 'Blue Star' is a fully hardy perennial that flowers from July to September and suits borders, rock gardens and containers.

Stokesia laevis 'Blue Star'

Stokes' aster (Stokesia laevis 'Blue Star') | Perennial

Stokesia laevis 'Blue and White' is a bushy, herbaceous perennial cultivar within the Stokesia genus, known for forming evergreen rosettes at its base. This cultivar produces vibrant flowers reminiscent of cornflowers, with a distinctive blue and white colouring that blooms from spring into summer. It thrives in full sun and prefers sheltered positions with fertile, moist but well-drained loam or sandy soils, favouring acid to neutral pH. Hardy to UK zone H4, it is well suited to cottage gardens, borders, patios, and wildlife-friendly planting, and its flowers are suitable for cutting.

Stokesia laevis 'Blue and White' is a hardy herbaceous perennial with evergreen rosettes and vibrant cornflower-like blooms from spring to summer.