Very early determinante tomatoes

[MrBig46]

Since 2015, I have been trying to grow tomatoes so that they are ripe at the end of May or the beginning of June (I do not mean the two or three ripe fruits). For those who have not been to Tomatoville, I want to state that the day of the last spring frost is May 15 in our country. I grow these tomatoes in a deep cold bed under glass without any heat source. The only source of heat is sunlight. I regularly plant tomatoes there immediately after the first day of spring, they grow there well and the temperature does not fall below 5 ° C even during night frosts. But I still struggle with the fact that the plants do not bloom and the flowers do not pollinate as I need to, because I am not able to keep the night temperatures above 11 ° C, which is necessary for the pollination of flowers.
That is why I sowed very early this year (actually last year on November 15) and currently I have seedlings with eleven to twelve true leaves behind the window and I can already see the basics of the first inflorescences through a magnifying glass. For the first time this year, I lighted the seedlings 6 hours a day to support the growth rate. I hope that in a month I will plant seedlings with small fruits and pollinated flowers. It looks promising.
Vladimír
PS.:If anyone interest where I live, I live in a similar panel house as seen opposite in the picture. On the third floor, I have one such window facing northeast for growing seedlings.

[Nan6b]

I admire your dedication, with only a northwest window to grow indoors. Can you show us your cold bed again?

[MrBig46]

Two photos from 2019 and improvements for 2021.
Vladimír



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uploading pictures

[MrBig46]

On Tuesday, I planted my determinant plants in my cold frame.
Vladimír

[MrBig46]

At the moment we have cold weather, it freezes at night. On Thursday, I covered the coldbed with a non-woven fabric and I watch the temperatures outside and in the hotbed. So far, so good.
Vladimír

[Nan6b]

Wow! The temperature difference is excellent!

[MrBig46]

So far, my tomatoes don't want to ripen. I have full of green tomatoes and only the smaller Sophie's choice, Sarayev Gruntovyi and 0-33 I gradually harvest. Yesterday I plucked the first bigger tomato, a steak (heart?) EM Champion. Sweeter (Brix 4.8-5.0) with a pleasant tomato taste. It's not a giant (140 g), but it's a fleshy tomato with a few seeds. The plant is not very tall (it grows rather wide), so I will count on it in a deep hotbed next year.
Vladimír

[Rockoe10]

That little guy is a beautiful and meaty tomato. Wonderful garden you have there Vladimir.