Are they a micro cherry? As in the plant is supposed to stay under a foot tall, micro sized. If they are a larger plant, could be your grow space and pot are too small to support it. Even with growing micros in the past I give them at least a 2 liter pot, if not a bit bigger. How big are your plants getting out in the garden? If you keep trimming it down, it could be trying to produce foliage or diverting energy to healing/growth and it's feeling not ready to start producing flowers. How long ago is a few months ago? Different tomatoes have varying rates of maturity.

Where are you located? Do you have a picture?

They will never bloom if you keep cutting them back. You're probably cutting off the tips of the branches where there would have been blooms. They have to be blooming in order to be pollinated, and then a cherry tomato will grow from each bloom. They should be grown outdoors in large pots or in the ground.

Cherry tomatoes are almost always indeterminate varieties. That means they continue to grow and set fruit all season long and so grow to a significant size - 6-8 feet is typical and they often get larger. I have a very hard time imagining cherry tomatoes growing indoors successfully outside of a full greenhouse operation. Certainly starting them indoors makes sense but the plants get far too large and lack sufficient sunlight indoors to flower and set fruit. I grow them outside in 20 gallon containers and by the end of the season the roots have completely filled the container. I'm not sure what you think a 1 liter container is going to accomplish as it is nowhere close to being a adequate size.

Adding that shaking your plants won’t encourage flowering. Shaking (or buzzing) a tomato to stimulate pollination would only occur after the formation of flowers, not before.

I grow some tomatoes inside from seed, but under some pretty bright artificial lighting and pot them up a couple of times before the spring planting outside, ending up in gallon containers by the time I plant them in the garden. The plants are typically flowering or budding by the end of winter.

But, even I don’t grow cherry tomatoes.

lack of proper flowering.. IN ANY PLANT.. is usually a function a lack of proper light or sun ... that why you cant grow roses.. or dahlia.. etc.. in any shade .... or indoors ....

these plants are middle of august full blistering sun plants... they are not going to thrive in the house unless you have them under some serious supplemental light ...

and even without a pic.. i can tell your plants are seriously etoliated.. tall and scraggly.. forcing you to keep cutting them back ...

of course you have to continue with the experiment.. if for no other reason.. than toe LEARN.. and report back to us.. how it goes.. hardening them off to full sun.. will be a very long process ... done correctly ...

im not sure i would try it with anything other than a tomato.. since you can buy it as deep as you want.. to offset some of the etoliation ...

my last thought... back when i dabbled with winter seed.. my biggest error.. was starting the seed much much to early .. because i was so hard up to play with plants during a cold MI winter... in my MI.. Ts dont get planted until mid to late may.. so starting the seed in january .. is not the right time.. start the seed in early march.. under properly light.. would give you a nice stout plant to start hardening off in late april ...

sooo.. next year.. dont start so early.. and have a light setup ... and good luck...

ken

With an Aerogarden, one can grow tomatoes in the system. But the system is meant to handle smaller determinate plants. Since the OP is using seed for plants meant to be out in the garden and more likely indeterminate, and is not using the seed varieties meant for the system, it's likely they are overloading the system. The foliage is outgrowing it and needs cutting back, the root mass is outgrowing it and at a L is still too small.

At a few months in of this treatment, the plants might be too stressed to be worth it to try putting them outside. Especially if they have to keep treating the plants like this for however many more weeks till it's warm enough where they are to put them outside.

I will follow your guide. Thank ou very much!