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greenhouse temp.

Hi,
on most seed packets it say germinate at between 15 deg and 20. At night my greenhouse goes down to about 5 deg. as would a kitchen windowsill. How important is it to keep the temp up to 15 deg at night? Thank you.
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Posts
depends on what you're growing, some seeds are more fussy than others. It's still only February so no great need to rush with most things.