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long-day plant

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A plant that flowers only after being exposed to light periods longer than a certain critical length, as in summer. Spinach, lettuce, and some varieties of wheat are long-day plants. Compare day-neutral plant short-day plant. See more at photoperiodism.

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Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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