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Old October 4, 2018   #19
LDiane
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I just hauled out an old book I haven't read for many years - The Edible Indoor Garden by Peggy Hardigree, St Martin's Press, New York, 1980.

Lots of information on tomatoes, but I'll just copy a bit about light.

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.
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