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I'm new to this! Not sure what I'm growing or where I'm going wrong... I have several of these trees just about 10 month old. About half are OK and looking good, the other half are wilting and the leaves are dropping off.
I have used feed and think some are suffering from burn.

They are currently in a warm conservatory. Watered when needed.

I just need to know whether they shed leaves? What type are they, how best to care/feed?

Any help would be awesome

Any help would be awesome

I am not an expert, so I can only give you my best guess. I would recommend hoping/waiting for one of our more experienced posters here.

To me that looks like a Flame Tree, if the leaves kinda fold up at night (looking at the branch in the back/top/middle).

My other guesses would be Brazilian Rosewood, or Blue Jacaranda. But I don't want to mislead you, I would see if someone who knew better could lead you the right way as I am still learning and could definitely be wrong.

No! That for sure doesn't look like a flame tree as you can see that the tips are kind of pointy, it looks like a blue jacaranda (I'm growing a few of these from seeds myself, although they're from my backyard). You should not keep them in a warm climate! Keep them cool until they're about 1.5 years old. What hardiness zone are you in? They best grow in the SoCal-Arizona side in the US. (Though you may not be in the US.) The hardiness zone they thrive in is around 9a-9b. (Which is where I live) You should stop watering them on a schedule, water right when the soil feels slightly moist. It looks like the leaves are drying and getting fried, keep a humidifier next to it to prevent leaf drying. (though it is not enough to do that) Give it a thorough watering now (Like right now, when you read this message) because it is probably already half dead. Do the bark scratch test, where you remove a layer of the bark to check the colour:

If it's green, it's alive.
If it's brown, probably dead.

These trees are semi-deciduous, in other words, they lose their leaves for a very short period of time in the winter. Not during this time. One time, I took a cutting off of the Jacaranda tree in my backyard, but it's leaves fell off after a few days. (Because of lack of water.)

Long story short: This tree is a jacaranda, these are semi-deciduous. The leaves have dried up, give it a thorough watering, NOW.

I hope that this helps, sorry for the long answer!

Oh, and a short note: Keep them between 70-80? F (21-31? C) and give them plenty of sunlight, but keep them indoors until they are 1.5 years old.

First you should focus on identify this tree...
By the look of it, I would tell you it's bud really looks like a Flame Tree, but the leaves don't look that much...

And well, I can tell you for sure that this is not a Jacaranda either...

Do you have any picture of the seeds?

Reference:
Jacaranda leaves' very tip are always single and pointy, never doubled...

My guess, is that this is a Leucena as we call here.
(Leucaena leucocephala)

But yes, could be another mimosoideae

Brother, you have better attention than me.

I just noticed that blue jacaranda tree leaf tips are single-pointed.

Could be a flame tree... But may also be Leucaena Leucocephala.

Maybe the OP can confirm what species it is.

NEVER do a scratch test. it does NOT tell you ANYTHING.