I bought 2 bonanza dwarf peach trees back in 2009. They are planted in the ground and have doubled in size since being planted. Currently they are about 4' - 5' tall. They are healthy, bloom like crazy, and every year for the last 3 years they've been covered with "would be peaches" HOWEVER the fruit NEVER develops into an edible peach. The fruit stays green and gets a bit bigger than a peach seed then JUST STOPS. Why? Is this normal? Granted, I probably shouldn't have bought peach trees at Lowes but I'd never seen a small variety and the tag on these said they wouldn't get larger than 6 feet (which was perfect for my yard). Why are they setting fruit but not producing mature fruit? Here's one of the trees (below). The other one is 8 feet to the right (not pictured). Here's how big the "fruit" is (below). It has been this size for a month with no sign of getting any bigger - just like last year, and the year before that (sigh).

Let me add to John's excellent advice - I agree, not a fan of MG, and it's really not organic. Frankly, all non-organic fertilizers become organic as the break down. You don't need to use nearly as much with a non-organic product (so you save $$$$), and as long as you're giving your trees enough water, any salts from non-organic fertilizers that might possibly build up will be leeched out. Vigoro Citrus/Avocado is fine, but I do prefer Gro Power Citrus & Avocado Food. It contains a large amount of humic acid, which is very helpful if you live in S. California or AZ (you don't say where you live in you GW signature). Watering 24 inches is plenty - citrus feeder roots exist in the top 18 to 24" of soil. Also, you need to remove the grass from under your trees. Grass will compete with the Nitrogen, which is what looks like is happening to your trees. Citrus are heavy nitrogen feeders and so is grass. I agree with John, looks a bit like salt burn, but I also think you need some micronutrients as well. You can apply Grow More Citrus Grower's Blend as a foliar spray or soil drench to really give your trees a micronutrient boost. I haven't tried Bayer Bayfolan Forte, so I'll have to check that product out, John, thanks for the suggestion. We typically see this here in my area in January through February, when we get our cold rains. That causes our micronutrients to be locked out, and washed away, so you may see your citrus, especially the young citrus, get a little chlorotic looking. Make sure your trees are being drip watered, and not being watered by overhead sprinklers. Citrus trees do not like their trunks constantly wet. And for us here in S. Calif, our fertilizing times are March through October, to avoid flushing during times when we might still get a frost, thus damaging that new flush that can occur when you fertilize. Patty S. Here is a link that might be useful: UC Davis: Backyard Orchard - Citrus

I agree with the not fed enough thought. Plants will often steal the nutrients from the older leaves to support the new growth and flowers, but it's not good for the long term health of the plant. What brand did you use? It would be better to fertilize on a regular schedule rather than as a occasional quick fix. Osmocote Plus is easy to get and works great for container citrus. Many folks here also supplement with DynaGro Foliage plus. Don't use fertilizer stakes or granular fertilizer, that's more for in-ground plants. I don't use epsom salts (magnesium sulfate)by themselves as it's easy to over or under dose with them. Too much can be a problem. Most quality citrus foods have Magnesium as a micro-nutrient in the correct amount. Also, to me it looks more like a nitrogen deficiency.

That is the very reason I feel so confined to my home until it's time to put all mine outside and hire someone or use a family member to hose them down when ever they want....I don't trust anyone watering mine for that long...I am sorry you lost it and then again you could always start a new) God, just don't let any of the workers from 4Winds see that poor thing, they might have a cry over it..I am sure it once looked spectacular!