Question
 I have a Key Lime tree in Fla. Bay area, and the tree looks very healthy but is not producing any fruit.  Any suggestions


Answer
Not much to go on here . A lot depends on how the tree was started. Starting a tree from seed is not advisable as the fruit will usually differ greatly from the parent plants, and it will be 9 or 10 years before it bears. Trees normally will begin flowering in early spring. Grafted trees begin bearing within 3 to 4 years. There are male and female flowers, and you will need to hand pollinate if your tree is indoors during flowering. Timing and duration of bloom, and ripening of fruit, is heavily dependent upon your climate and the variety of tree.

Is the tree blooming? Is it a lime grown from a seed? And was it a shop bought lime? If it was, you could be waiting another 3 - 7 years I think.

Also, how big is it? Are you pruning it? If you're pruning it, you may be constantly delaying it from becoming mature enough to develop flowers and fruit.


Might try this to speed up the process.
Watering should be slow and thorough; probably every couple of weeks would suffice in any but the very sandy soils. Nutrition should continue at about one cup of ammonium sulfate per year of tree age annually in split applications in February, May and September, i.e. a 6-year-old tree should receive about six cups of 21-0-0 for the year. Adjust the rate for other fertilizers based upon the relative nitrogen content.

Lawngrass should be kept back about a foot from the canopy of the tree. Other than cold damage, no pruning should be necessary, as the lime tree will develop its natural shape without pruning. While mulching is not recommended for citrus trees, if you must mulch, keep the mulch at least one foot away from the tree trunk.