Take avocados off your list. They are very thirsty! High maintenance. According to an article I read on yahoo this morning, due to California's drought and the costs of keeping them alive and healthy, Avocados are the next caviar! We have 3, and they do require a lot of water. Most plants require water while getting established. Prickly Pear might be your best bet. I have one fig tree that wilts in the heat. Violette De Bordeaux. Panachee Fig turns yellow and drops her leaves if her emitter is clogged and she doesn't get the water she loves. We named one of the paths that meander through our acreage "Olive Lane," because we planted two Olive trees to flank it. They both are on the drip system. One tree is thriving. The other is stunted. Both very green. For a year one had no water and the other did. We didn't notice the broken emitter. A drought tolerant vegetable tree is Moringa Oliefera. We grow that as a hedge and use the leaves in salads. I'm not a fan of the pods, but the trees buzz with bees after the flowers.

Has anyone ever done work with the Australian desert lime . What crossbreeds are possible ?

Several decades ago, I hybridized Poncirus trifoliata and Clementine mandarin using Poncirus as the pollen parent as Clementine is 100 % monoembryonic when used as the seed parent. The only difficulty was the timing of flowering of the 2 parents. Some of the flowers on the progeny were misshapen and not capable of setting fruit. A few of the hybrids were vigorous and fruited in a solar greenhouse without supplemental heat in southeastern Pennsylvania. These trees were planted directly in the soil with the perimeter of the greenhouse base insulated 4' deep using panels of Styrofoam insulation. One of the trees fruited with Clementine-like fruit, deep orange, seedless, not bitter, but tart, about 2 inches in diameter. Regrettably, I discontinued covering the greenhouse and lost the trees to winter cold. I had previously sent 2 scions to an amateur citrus breeder in Tifton, GA. He was an elderly gentleman at that time and they may not have been further propagated. These trees began flowering and fruiting at 5-6 years of age. I did not fertilize these plants and did no pruning as flowering began on the most distal branches, especially on the longer upper branches beginning to bend downwards.

I just bought a red finger lime tree from home Depot. If you go to the citrus section and look at the lime trees they each have different tags with the varieties on them. I found one left. It was 39$ I'm in st Pete Florida. It specifically says it can only be sold in Florida not shipped.