Historically, the last frost date is March 15 in the Las Vegas Valley. Planting warm-season vegetables before this date, such as tomatoes, peppers and eggplant, can be a bit risky because of a chance for frost.
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You had an article a while back about trimming oleander down before spring. I have five in my backyard and have never done that. I am afraid to trim them down.
Powdery mildew of grapes is also a problem if there is not enough air movement through the vine or past the bunches so they dry. It is best if the vine is growing in full sun.
I was reading about your use of pheromone traps for insect control in fruit trees. Which traps do you use, and when do you put them out?