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Blue palo verdes Cercidium floridum turn bright yellow in late April, followed two weeks later by the much more abundant but paler yellow foothill palo verdes C. Desert ironwood trees Olneya tesota bloom heavily about every other year with masses of lavender flowers, usually in late May. The abundant ocotillo reliably produces spikes of red flowers through-out April. These species bloom about two weeks earlier in western Arizona.
If you want to see the famous carpets of color, keep abreast of local news from Palm Springs to Tucson and from Death Valley to northern Mexico. Begin checking in January lest you miss an early show. The dunes can sometimes begin in November, but this catches nearly everyone off guard so it's pure luck to discover such an early show.
You'll find masses of annuals somewhere in this area about once every three or four years. If you want dependability and will settle for less quantity, success is almost guaranteed in the middle half of April. The summer flowering season season begins a few weeks after the first summer rain and continues into late fall. Though there are many beautiful species to be seen, there are rarely massive displays of color in this season, because the summer rains are more sporadic and localized than the winter rains and the soil dries rapidly in the heat.
Summer annuals such as summer poppy Kallstroemia grandiflora and devil's claw Proboscidea parviflora germinate within a few days after the first soaking summer rain and begin to flower as soon as three weeks later. Chinchweed Pectis papposa is the most widely-adapted summer annual; it ranges from New Mexico into the central Mohave Desert where it is the only summer annual summer rains are uncommon in the Mohave. It can form showy carpets of yellow when rains are abundant. Herbaceous perennials and small shrubs bloom opportunistically if they get enough rain. Trailing four-o'clock Allionia incarnata and desert marigold Baileya multiradiata are nonseasonal, flowering in response to rain in all but the coldest months.
Fairy duster will also bloom again in wet summers, but not as profusely as in spring.
Sacred datura Datura wrightii is mainly a summer perennial though it may begin flowering as early as April in warmer areas. There are several woody shrubs that bloom in late fall.
Most are composites such as burroweed Isocoma tenuisecta and desert broom Baccharis sarothroides. Desert senna Senna covesii and Coulter hibiscus Hibiscus coulteri flower in response to any warm rain and peak in summer when most such rain occurs. Desert zinnia Zinnia pumila is truly biseasonal, flowering well in both rainy seasons.
Cacti include several summer-flowering species. The pincushion cactus Mammillaria grahamii microcarpa makes buds during its previous growing season, then goes dormant during the dry season. The buds burst into bloom five days after each of the first two or three summer rains. The fishhook barrel cactus Ferocactus wislizeni is much larger thn the pincushion and less dependent on rain; it flowers throughout August and September.
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Trees and large shrubs are nearly all spring bloomers, but a few bloom again in summer if rains are generous. Whitethorn acacia Acacia constricta , velvet mesquite Prosopis velutina flower heavily in spring and often again in summer. Desert willow Chilopsis linearis flowers from spring through fall if it has enough water. Though the Sonoran Desert has two flowering peaks, there is almost always something in bloom.
The only exceptions are after a hard winter freeze or during severe droughts. Become a Member! Adopt a friend! Green Initiatives.
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Desert Diaries. Share your photos! Desert Wildflower Blooms Spring Flowering Season The spring flowering season in the Arizona Upland subdivision spans from mid February to mid June with a peak from mid March to late April depending on rainfall and temperatures during the growing season. Winter Annuals Winter annuals such as poppies Eschscholtzia mexicana , lupines Lupinus sparsiflorus and others , and owl clover Castilleja exserta , syn. AZ tax credits.
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