Plants that bloom in September in Zone 10 with green flowers

Blue Grama Grass

Short clumping grass with distinctive eyebrow-shaped seed heads thrives in dry soils.

Flowering Tobacco

Tubular flowers that release sweet fragrance at dusk. A cottage garden classic that attracts moths and hummingbirds.

Sedum

Succulent leaves, tough as nails. Ages to deep crimson in autumn.