Question
In 1974 I planted multiple Loquat seeds, in Santa Barbara, CA, which all turned into fruit bearing trees.  Years after moving, I was able to obtain fruit from the trees and planted more seeds in the Oakland area.  I now have six trees that are approximately 6 - 7 feet tall (4 to 5 years old).  I have drip lines around 5 of the trees and the soil is always wet, for the 6th tree I water it by hand everyday.  The soil always appears dry on top by the next day, unlike the others that have the drip line.  This sixth tree has developed a handful of yellow/dark yellow leaves.  Could this be from over watering?  There are numerous new lighter green leaves on the top of the tree and on the new branches.  If watering is an issue, how often and how much should a loquat tree be watered?

Thanks,

Steve

Answer
Dear Steve:

Although, I've never grown loquats, my research for your question revealed much information and motivates me to try an experimental planting.  

My research revealed that yellowing leaves on the loquats are a sign of over watering. They aren't picky about soil but it's really important that they have good drainage. They are considered a drought tolerant tree once established.  They prefer deep watering.   Suggest you consider deep mulching established trees and water them every two weeks.  The deep mulch (6 to 18 inches) will retain the moisture between waterings.

Like all trees, loquats need frequent watering during the first few months after planting. But once established they have good drought tolerance. Only occasional watering is needed to keep them attractive. Regular watering, however, is necessary to produce good fruit. Loquat trees do well in partial shade and are tolerant of a variety of soil types with good drainage. Loquat trees can withstand drought, but prefer regular, deep watering. Light applications of nitrogen fertilizers one- to three-times per year are suggested ?too much nitrogen will reduce flowering. Loquats also respond well to severe pruning, which should be done just after harvest

To encourage good fruit development on loquat, it is also necessary to occasionally prune out some branches throughout the canopy of the tree. This thinning will open the tree up to allow light in and increase fruit production. Loquat should be pruned after danger of frost has past but prior to spring bud-break.

Regards,

Mack Jean
AllExperts
Master Gardener
Tennessee