(Before the weather update, 08/20/2025.)
With no sunlamps, grain takes 4 days, vegetable seeds take 5 days, fruit seeds take 7 days, wild seeds take 8 days.
With 1 to 2 sunlamps, grain takes 3 days.
With 3 to 10 sunlamps, grain takes 2 days.
With 11 sunlamps, grain takes just 1 day.
With 12 sunlamps, vegetable seeds take just 1 day.
With 18? sunlamps, fruit seeds take just 1 day.
With 21 sunlamps, wild seeds take just 1 day.