Should I remove young tomato's first flowers?

Question

My case is rather experiment, because usually the gardeners first make them to sprout and grow in pots, then move to final place in the garden.

I decided to let them to sprout and grow at final place in my garden, from beginning to end. So, I got them to sprout in the middle of May. Now, they are approx 30 cm tall, while that variety is going to reach 1-1.5 meters

That's how they look now:

First flowers appear at the top of the plant (not open yet).

How do you think: should I remove first flowers now to prevent too early fruit so they will stop grow, or leave everything as is?

Answer 1

Your tomato looks great. Just leave everything as it is - do not remove those flowers or you'll just decrease your yield.

Answer 2

to prevent too early fruit so they will stop grow

That's not how tomatoes work.

You either have determinate tomatoes, that will stop (regardless of anything you do, so removing flowers will just reduce yeild) when they are ready to ripen off a bunch of fruit and die.

Or you have indeterminate tomatoes, that will grow and set fruit until something else (frost or blight, typically) stops them. In areas without frost they can grow and fruit for years if blight (or a hurricane) doesn't get them. Removing first flowers will both reduce and delay your yield.

Since your Ondraszek tomato is determinate you don't really want to prune much of anything. Good luck! The main issue with direct planting in cool climates is beating the frost on the time to harvest.