WILDFLOWER SUPER BLOOM - ARIZONA DESERT SPRING WILDFLOWER MADNESS

#wildflowers #superbloom #Arizona

A super bloom is a rare desert botanical phenomenon in which an unusually high proportion of wildflowers whose seeds have lain dormant in desert soil germinate and blossom at roughly the same time. The phenomenon is associated with an unusually wet rainy season. The term may have developed as a label in the 1990s.

The conditions under which a super bloom can occur are exceptional. Because some invasive grasses, such as bromes, will compete with native flowers for moisture, the desert must remain dry enough prior to the bloom to keep them from becoming established.[1] The desert must receive rainfall in the autumn, and this rain must penetrate deep into the soil matrix in order to reach a majority of the dormant seeds of flowering plants. If subsequent rainfall is excessive or inundating, the young plants may be carried away in flash floods; if it is inadequate, the seeds will die from dehydration.

Next, the ground in which the seeds lie must warm slowly over the several months which follow the first soaking rain, and the desert must have enough cloud cover both to shield the soil from intense daytime desert heat and to insulate it from overnight freezing temperatures. Finally, once the newly germinated plants have reached the surface of the soil, the desert must remain undisturbed by strong winds which would uproot the plants or damage the young shoots. The rare concatenation of these events is what makes a super bloom such an extraordinary occurrence.
wikipedia.org

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