I've used Rebar and Electrical conduit to tie my mangoes to it...you just have to be
very careful when you do it. My Cogshall had the same problem last year...my tree is very short so the fruits were literally inches off the ground so I had to raise it and tied it up. I'm going to have to do the same thing this year.
These were from Last summer.
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Meant to say you can also tie them to one of your larger branches... I did this to a few of them too but ran out of branches I could use so I had to improvise,lol...