Many of us in Southern Arizona look forward to spectacular wildflower displays in the desert as winter ends β but this springβs bloom could be a bust.
The reason: An almost total lack of autumn rains needed for germination of colorful annual wildflowers such as showy gold poppies and blue desert lupines.
βThe annual flowers will most likely be the poorest showing in several years,β said botanist and wildflower expert Mark Dimmitt.
That view is shared by other experts.
βIf nothing happens with rainfall in the next few weeks, Iβm thinking spring will be dismal for annual species,β said John Wiens, nursery horticulturist with the Arizona-Sonora Desert Museum west of Tucson. βWe know that a good germinating-rain event is needed to get them started, followed by regular rains every couple weeks to sustain them. Temperatures must play a big part in it, also.
βI havenβt been able to analyze our weather data here at the Desert Museum, but I feel this fall ranks as one of the driest,β Wiens said. βHere at the museum, we have had only one measurable rainfall since late August.β
STILL SOME HOPE
βThere have been occasional exceptionsβ to the disappointing bloom that usually follows extremely dry autumn weather, said Dimmitt. βUnusually warm and heavy rains that fall in January or even February, followed by another couple of warmer and wetter than average months, have produced good late spring displaysβ in some deserts.
Wiens added, βAll may not be lost for flowers. If we get a few rains this winter, Iβll be checking out washes and roadsides for seedlings.β
PERENNIAL POSSIBILITIES
Some perennial wildflowers, such as penstemons and delphiniums, could provide pockets of pleasing spring color, even if annuals donβt come through.
βPerennials are less sensitive to the timing of rain,β Dimmitt said. βA single soaking rain in late winter can make many of them flower.β
Perennials, Wiens said, βcan be resilient to droughts. Some species do better than others. Creosotebush is one that will probably bloom even if the winter rains remain poor. Brittlebush bloom will probably be spotty β maybe just on roadsides.β