I have 3 heirloom plants growing, staked, in a large cedar box on my roof in NYC. I realize that I have let 2 suckers grow very large at this point on 2 of my plants (each) - they are both about a foot long, and relatively thick, and flowering at the top. Both of these plants are growing vertically very well, and have a TON of flowers, but very few fruits forming. My plants are about 3 1/2-4 feet tall.
Is it too late to prune these suckers without "shocking," and harming my plants?
I have read that I can trim suckers off and plant them and hope they turn into new plants - this would be nice but not required - I only want the best tomatoes regardless of quantity.
Also, will the suckers which are flowering produce fruit?