The spring blooms depend on all factors and individual plant responses. The right amount of winter rain pro misses hope. Then the timing of spring rains influences the low ground cover. The heat makes a difference. Early heat this year has confused many plants. Palo Verde, and ironwood are doing things the last two weeks in March that usually happen in May. Some of the species are confused and some are still waiting.
These three or four plants than are making the display so intense this year (and early) started off for a week, peaked for a week, what you see here. A week later they have curled up getting their seeds ready. Pretty quick. Still there are many in full give me bees mode. The mallow bloom longer. Part of this timing has to do with the lack of rain. It is almost as though they dried up. I think that with another well timed rain, they would have gone longer, but we got just a trickle. Then, sometimes a strong rain or wind will strip the color away in an afternoon. On the ridge tops they curled up, but around my house below, they haven't yet. The bees don't swarm this early, so the timing for all of the brittle bush (the bright yellow bushes) wasn't so good, but they have grown a great deal this year. They had been died back from a drought a few years back.
It is getting time for the succulents to explode. There are lots of buds.
There are many smaller spring plants that are going off along the ground during this. To give you an idea. I plotted two 10x10 foot spots for a couple of years. I counted like 35 different flowering plants through the course of that. This IS the most bio-diverse spot in Arizona, as the forest service states.
Elevation has a lot to do with the timing of the desert garden, too.
The rule of thumb used to be, about every seven years, the whole thing would go off at about the same time, making an incredible show. With the climate changing, this has happened two or three times, the last ten years. In my memory, this is a pretty wonky year, with these species blooming so early.
I love watching this place, how and why things vary. It looks as though the place is dead and gone, the rains come and it's wonderland again.
All factors, change from year to year, so you just don't know when or what you're getting.
Jbee