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I really have no idea! :(
They make the most of the sunlight in spring and flower then, as they are shaded by trees in the summer, and can't get much light - it's a type of adaptation
The equator gets 12 hours of sunlight every day of the year (this only refers to the actual equator, not the Tropics in general, though sunlight doesn't vary much at the low latitudes either).
how much sunlight does a plant need
some sunlight
On the first day of spring you get 12 hours of each (it's the equinox). After that you get more daylight every day until the last day of spring ... how much more depends on how far from the equator you live.
200000000000000 miles of sunlight
grasslands get 80% of sunlight a year
200000000000000 miles of sunlight
Cherry trees don't need much sunlight
??? all plants need sunlight
How much sunlight is in the mesopelagic zone