you could end up with pot ‘weed’ plantes that way, a friend of ours got the city stuff, and they ended up with pot plants...they are older people and didn’t know what was growing in their yard.
I have volunteer cherry toms, and they grow better than the ones I buy or try to grow myself. They only get part sun for the day. Mine now because of the temps look like dried up weeds, despite generous watering. Keep trying to keep them to a few, but it is hard to keep them thinned out. Only good for salads and such, where I want to freeze quarts of toms, instead of buying cans of them.
Yes, you never know what is in the “Free” compost from the city.
We have had several weeks of blistering temps also. things trying to grow are sort of at a standstill- but we might be past our real hot heat- at least this week we have cooled down. I hope it cools for you and some rain gets thrown in the mix. Having a few weeks of blistering temps is not like all summer mixed with no rain like friends in Texas have had.