A few months ago, I picked up some Micro Tom cherry tomato seeds from a website called “Totally Tomato”, they’re a hybrid species, that claims to be the world’s smallest cherry tomato plant, fully grown, the plant is no more than 8" tall, and they can flower and set fruit at 3" tall
I planted one a couple months ago in a homebrew hydroponic rig made out of a Glaceau 32 oz Vitamin Water bottle with an airstone stuck in it
It’s now just 2.5" tall, and it’s already getting ready to flower!, it’s definitely a tiny plant, lots of fun to grow, I can’t wait to see how small it stays and how many tomatoes it grows, as well as how tiny are the tomatoes themselves going to be?
it is a hybrid plant (probably not able to save the seeds for another generation, they won’t breed true), and a determinate plant so it generally sets fruit all at once then dies, rather than continuous fruiting like a non-determinate does, but non-determinates can get quite tall, it’s a trade-off, if you want the plant to stay small, it’s probably going to be a determinate species
there are open-polinated non-hybrid varieties available, but they grow a little taller (8-15") but they are still determinates;
Red Robin (8-12" tall)
Tiny Tim (12-15" tall)
The Micro Tom is almost like a Bonsai plant, I could quite easily plant up to six of these tiny 'mater plants in my AG6, and never have to raise it’s hood past the second notch, planted in a small dirt pot, it could be the perfect houseplant