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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.
Step 3. Make sure the tomato plants are under greenhouse fluorescent lights for 18 to 22 hours each day. The best temperatures to grow tomatoes in a greenhouse are about 70 to 75 degrees F during the day, and 65 to 67 degrees F in the evening.Transplant the tomato plants from the containers you purchased the seedlings in once they have grown about twelve inches.omato plants are an ideal addition to any garden or landscape, especially since three to four plants can provide a generous harvest within three months of maturity. Tomatoes can be grown outdoors in or in a greenhouse, with the latter being the easiest option because you can control the environment and temperature.