I bought a Sweetheart Lychee air-layer a month ago. It is less than a foot tall. I immediately planted it in a plastic container whose diameter matched the canopy size. For the first week, I kept it inside by a window that only got 5 hours of sunlight. Then I transitioned it outside for a full 10 hours of sunlight. The weather has been consistently over 50 F at night and lower than 80 F during the day. I water it 3 times a week, letting water drain out from the bottom. I've only put one crushed eggshell and some tea leaf pellets on the surface.
All the leaves eventually started browning from the edges and fell off. Some new leaves are sprouting, but they've shriveled before reaching full size. There's also a rusty color developing on the soil around the trunk. I had a similar experience with my Wax Apple (Jambu), but with only a third of the leaves getting scorched. That one recovered quite well by putting out new leaves without me adjusting anything. At one point, I moved the Lychee behind the posts of my porch to see if shade would help it, but it did not improve.
I would like some tips on how to revive this baby. It was $50 and it's not available in any local nurseries, so it would be a pity if it died.
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