I have had similiar experiences with certain trees including Lychee, avocado, longan,cherry of rio grand. I finally figured out it's my water. I started using rain water for all my sensitive trees and it has made a tremendous difference.

Thanks for comment. I actually don't have anything else than rainwater so this is't that... Any other ideas? I'm almost sure is the soil. I will replant them in classic soil for flowers and hope it will make a difference.

Jure,

It's good you didn't use any fertilizer on your Lychees as they are very sensitive to it. I've started a few seedlings myself just for the fun of it and I've noticed that when they are left dry too long between watering, their leaves will begin to dry up. I'm not sure yours is the case. They like to be watered once the soil becomes dry, but not soaking wet all the time.

Are you growing the seedlings to produce fruit at a future date? Lychee seedlings unfortunately don't produce fruit quickly. I heard it may take 8-10 years. I have some seedlings which I started 8 years ago and they are still in the pot and never fruited at all. Then, I have also quite a few lychee trees in the ground that are about the same age. Some of them have produced fruit already--though they don't always have a lot of fruit every growing season for me. Assuming that you do wish to have the fruit soon, I would suggest you order an air layered or grafted plant and plant it in the ground. They'll grow quicker and bigger for you and the fruit production will definitely be more than those cultivated in the pot. Even when cultivated in the pot, the air-layered or grafted ones will fruit at 3-4 ft tall, but of course the fruit is scanty.

If you're just planting them for a hobby, they're nice little plants to look at. I have some sitting on my window ledge and I enjoy looking at them whenever I enter or leave my house. Have fun with your little seedlings.

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Thanks for answer lavenderosey! Regarding watering of plants, I try to water them when I see that the soil is becoming dry.

In any case, I have them only for a hobby as the weather in my country (Slovenia) does not allow this kind of plants (freezing winter temperatures). I'm also not expecting them to have fruits, only for the view.

As I said, I will replant them in regular flower soil and will see if the situation improves.

Thanks all for the help!

i just posted about this for someone else, so hope yo dont mind copy and paste...

i have several seedlings. mine have done that too. i have one doing it now, and i think its a couple of things...

1 - too much water. they seem to like constant soil moisture. not to wet or too dry. and too wet seems to impede nutrient uptake. i think this is why ive heard many lyche growers say mulch is important.

2 - Lychee seem to need live soil. - worm castings , compost tea , mycorrhizal fungi...

3 - sometimes they try to put out more new leaves than the plants can handle. the roots have to bring up minerals, water etc... not enough nitrogen, or other mineral can cause it, but if there are not enough roots, adding chemicals will just make it worse... so, what i do is prune 1/2 of the new growth off. it takes the demand off the roots and lets them provide all the nutrients to just a few leaves... this has actually helped me.

http://forums.gardenweb.com/discussions/3646259/help-with-lychee?n=4