Plants that bloom in September in Zone 11 with yellow flowers

Angel's Trumpet

Huge pendant trumpets release intense evening fragrance over a long warm-season bloom.

Calendula

Bright daisy-like blooms in pumpkin orange and gold. Edible petals brighten salads and the plant keeps blooming through cool weather.

Calibrachoa

Mini petunias that bloom nonstop in hanging baskets. Dozens of color options and no deadheading needed.

Cape Honeysuckle

Clusters of vivid orange-red trumpets bloom from fall through spring. Evergreen in mild climates and a hummingbird magnet in every month it flowers.

Cassia

Showers of bright golden flowers cover the shrub in fall when little else is blooming. Sulphur cassia, a butterfly host plant that lights up the autumn.

Celosia

Flame-shaped or crested flowers in electric colors that dry beautifully. Heat lovers that thrive in summer.

Crossandra

Glossy leaves and asymmetrical apricot-orange blooms held in tight spikes. Firecracker flower, blooms steadily in heat that wilts other tropicals.

Desert Marigold

Cheerful desert wildflower that blooms almost year-round in warm climates. Thrives on neglect.

Hawaiian Hibiscus

Large tropical blooms in vivid colors appear repeatedly from spring through fall.

Pink Plumeria

Clusters of pink, sweetly scented blooms cover this classic tropical tree in summer.

Pride of Barbados

Flame-orange and yellow flower clusters that hummingbirds and swallowtails cannot resist. Thrives on heat, dies back at frost, returns every spring.

Statice

Stiff papery flower clusters that dry to keep their color for years. A cut-flower farmer staple for wreaths and dried bouquets.

Strawflower

Papery petals that already look like dried flowers when fresh. The original everlasting, hanging on long after every other bloom fades.

Sweet Olive

Small clustered flowers perfume the garden with an apricot-like scent over a long season.

White Plumeria

Highly fragrant white flowers with yellow centers appear in clusters on succulent branches.

Yellow Bells

Clusters of bright yellow trumpet flowers bloom for months in the heat. Southwest staple that takes drought and reflected heat without flinching.