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In general, tomatoes take around 60 to 90 days to grow and then ripen. In a hydroponic system, because you are providing the plant with the absolute best growing conditions, I would expect this to be sooner, and you should be enjoying your tomatoes within 60 days at the very most.omatoes are fairly hardy plants, meaning they can thrive in a wide range of temperatures. Generally, a temperature of 18Â°C to 25Â°C is desirable during the day, and a temperature of between 12Â°C and 18Â°C at night time.
Starting seeds indoors six to eight weeks before the average last spring frost date, or directly sowing them in the garden after the last frost date once soil temperatures reach 60 F or warmer will produce seedlings. A temperature range of 65 to 75 F is best for tomato plant growth.When temperatures drop below this range, growth slows. Tomatoes will grow in temperatures warmer than 75 F, but you'll need to water more often to prevent wilting.emperature. Tomato seeds germinate readily in constant temperatures of 68 to 80 degrees Fahrenheit, emerging in six to 14 days. Although tomatoes will germinate in temperatures as low as 60 F, it takes longer.