"Experiments from 1957: Even though the tomato is day-neutral and can blossom in a wide range of day-lengths, it produces more flowers with 9 hours of light. Those plants flowered 10 to 14 days sooner than plants given 16 hours of light.
Unless the plants are given at least 7 hours of uninterrupted darkness each night, they won't bloom."
Very interesting information!!
Vladimír
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