March and April are prime months for wildflowers in Arizona. The fall/winter rains have been almost perfect for wildflower production, so this is a good time to walk or hike a desert preserve for great views. Or maybe you’ll even see a good show in your neighborhood.
Here are a couple of websites that will help you find great places to see the color, and help identify what you’re looking at.
Desert Wildflower Reports – http://www.arizonensis.org/sonoran/sonoranwildflowers.html
Southeastern Arizona Wildflowers – http://www.fireflyforest.com/flowers/
Phoenix and northern Arizona – http://www.desertusa.com/wildflo/az.html