I got giant 9 1\2-10 ft tall 10 ft wide plants in 30g smart pots, ROOTBOUND!

I would just feed and water like you have been if you can swing it. If not, like they said with a timer. I did the hydrogen peroxide and water dunk for my outdoor plants last year, lot of crap comes off. The burnt plastic should not be a large percentage of the ash and it should not stick on any worse than the rest.

Boatguy said:

Your roots have definitely made it through the pot and into the ground by now. Rootbound isnt really a thing in fabric pots.

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these are in the ground for sure. I bet they are not able to be rotated in place, I used to grow in bags on the ground even on heavy duty weed barrier x2 thick. they still went through.. ... I fixed the issue by putting the bags on stepping stone bricks so they air prune and stay 6 ft tall.

Plants look great.