We are in the middle of our citrus bloom here in Phoenix. I’m in a new house, with most of my citrus only in the ground for roughly a year, although several of the trees are pretty large as they were spade transplants from my prior home. All of them have done well and put on growth over the last 12 months.
I’ve noticed that this year, 4 of my trees (2 of the spades, 2 of the regular pot transplants) are 90% bloom with minimal new leaves sprouting. Any idea what the cause would be? Stress?
As far as I know that only happens when the flowers come out before the leaves, citrus plants puts way more energy in to the flowers than the leaves. Is your climate this year different than normal?
Warmer winter – no freezes for my area this year.
I’m thinking that it may be due to some sort of transplant stress. Now that the trees have settled in after not fruiting last year, they’re trying to make up.
Usually I see equal flushes of blooms and vegetative growth at this time of the year – again, it’s all flowers and almost zero leaves.
Could be, my only experience with citrus is in pots, it could be a nutrient deficiency or to much of a nutrient, like here where I live the soil is high in nitrogen and that is about it. Adding fertilizer would make the nitrogen level way to high, then again we mix other soil in to the soil here anyway because it’s clay soil yet still to much nitrogen. I am also starting to make a nitrogen free fertilizer because it’s not good to have to much nitrogen, by the way too much nitrogen can shock a citrus tree when it’s flowering or fruiting and make the leaves fall off, and not grow well. I think you should have your soil tested for nitrogen level and other things.
In my experience in coastal influenced areas of San Diego county, new leaves start after blossoms open.
For me, lots of blossoms and few leaves means tree is stressing out. It is trying to reproduce desperately as it senses the end is near. That’s how my Satsuma bit the dust! 
What Richard said. And, what Alan said. For us here in our coastal environment, if I see a bunch of new leaf flush right now, it is disappointing, because it usually means less blossoms. Leaf flush will follow blossoms. This is the time to fertilize. You’ll see nice leaf flush in about a month. Citrus will focus on one thing at a time - blossoms or leaf flush. Both take a lot of energy, so they will do one or the other, unless the tree is extremely vigorous and And, every cultivar is slightly different in their ability to handle one, or both. Vin, if a tree already has a full and healthy canopy, just blossoming is not a sign of stress. The flush will follow. 
Whoopsie, I read that wrong. If the tree has good foliage, then yes, no problemo
But you’re right if the canopy is suffering, and there’s leaf drop. If the tree is really suffering, it’s last ditch effort will be to produce some fruit to try to re-seed. It can be a sign of the “last gasp”.
Yes.
In my opinion, no. Fertilizers should have been applied periodically last year [in our coastal environment].
If the trees are very young (@hoosierquilt, your trees are too old), then this is a time for a nitrogen boost.
In our environment, yes.
Yes, I believe this is true for @at120 as I have coached gardeners in Glendale AZ on site in the past.
Not all my trees are old, some are just a few years (2-5) years old. A few are even younger. Some are older. A handful have been here for about 8-10 years. And, I have applied fertilizer last year. This is a new year 
I try to make my 1st fertilizer application in February, just before bloom, but if you haven’t applied that 1st application, apply now. I apply a second application in May/June, and then a 3rd in the fall. Here is a link to growing citrus in the home garden in California. I think the guidelines are good for us growing dooryard citrus in California:
Wow, my error. I thought your Citrus were all from the previous owner.