My flame tree is losing a lot of leaves?HELP!

[Amelia]

HELP! I am VERY new to this. I planted these Flame trees back in May (I think) and I have enjoyed them so much. They have been doing fine but these last few days serval of their leaves have been turning yellow and falling off. One of the trees even has bits of brown and black on the tips of their leaves. I was wondering if it was the changing of seasons that is causing this or is it something I’m doing wrong.
Also please forgive their janky shape... I’m trying to figure out how to properly train them!

 

[Yosemite Goat]

Google flame tree and see if they loose leaves......

 

[Pixar]

Flame tree looses leaves , cut them off from the trunk if they a don't look good . They will produce again eventually . You plant needs sunlight

 

[Plantnut]

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HELP! I am VERY new to this. I planted these Flame trees back in May (I think) and I have enjoyed them so much. They have been doing fine but these last few days serval of their leaves have been turning yellow and falling off. One of the trees even has bits of brown and black on the tips of their leaves. I was wondering if it was the changing of seasons that is causing this or is it something I’m doing wrong.
Also please forgive their janky shape... I’m trying to figure out how to properly train them!

How long did it b take for your flame tree to get that size, and when did you repot.

 

[Plantnut]

How long did it b take for your flame tree to get that size, and when did you repot.

It's now been a little over a month and I haven't repotted yet

 

[rockm]

It would help if you knew the actual name of the species of tree you're working with, where you are and whether it's being kept inside.

All that is crucial if you want actual help instead of guesses.