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« on: April 19, 2012, 12:29:48 PM »
behlgarden,
Just a few thoughts from a decided non-expert:
I planted my lychee (a Hak Ip) in-ground on slightly raised soil in a spot where its canopy is in full sun but its roots are in shade much of the year. I've heard a lot about the clay soil and high pH of our water not being to the lychee's liking (I'm in the Inland Empire), but mine is doing fairly well, so far. That may be in part because I started off with a more mature tree. I bought mine from Mimosa in a 15 gal pot, when it was about 6' tall. It seems to be doing well, and kept most of its foliage in spite of some Santa Ana wind-related damage. It is now blooming.
From what I've read, foliar feeding is probably a good idea. In addition, I've heard of a few other techniques for overcoming our less-than-ideal soil and water. For one thing, you may want to try replanting a bit higher, both to improve drainage, and to make fruiting more likely down the road. As I understand it, lychees fruit better if planted with the top of their rootball just above soil level. You might also try mulching around the tree to retain moisture, as lychees don't like to dry out. I've tried mulching with some bark mulch, but I've also added some peat moss around my tree, to retain moisture, and to improve the pH a bit, over the long-term. I've heard that adding gypsum can help break up clay soils a bit, and that it can, over time, displace some of the salts that tend to build up in our soil (and which lychees seem so sensitive to). Finally, I've also read that using a weak vinegar solution when watering by hand can perk up a suffering lychee, presumably by improving its uptake of nutrients from otherwise alkaline soil. I'm afraid I can't recommend a particular dilution, but I plan to experiment with this myself. Good luck!
James