Plants that bloom in March in Zone 11 with red flowers

Bougainvillea

Explosive cascades of papery magenta, hot pink, or coral bracts that smother walls, fences, and pergolas with nonstop color from spring through fall in zones 9 to 11.

Coral Aloe

Flat coral-orange rosettes produce vivid flower stalks in late winter. One of the hardiest aloes.

Hawaiian Hibiscus

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

Persian Buttercup

Ruffled, rose-like blooms in vivid colors brighten cool spring beds and pots.