Best Flowers to Grow in Arizona

Start warm-season annuals like zinnias, marigolds, and cosmos from seed indoors in late January, then transplant after your last frost around February 15th. For direct seeding, wait until soil temperatures consistently reach 65°F in early March. Cool-season flowers like pansies, sweet peas, and snapdragons should be planted in October for winter and early spring blooms – they'll often survive your mild winters and provide color when most gardens are dormant.

Summer success depends heavily on timing and heat management. Plant heat-sensitive varieties like petunias and impatiens in locations that receive morning sun but afternoon shade, and establish them early in the season before temperatures peak. Mulch heavily around all flowers to keep roots cool and conserve moisture during the challenging July and August period. Consider container gardening for varieties that need protection – you can move pots to shadier locations during heat waves.

Take advantage of your extended season by planning three distinct planting periods: early spring for heat-sensitive annuals, late spring for summer stalwarts, and early fall for a second wave of cool-season color. Many annuals like celosia and marigolds will self-seed readily in your climate, giving you volunteer plants for the following year. Water deeply but less frequently to encourage deep root systems that can better handle heat stress.