They need at least a good 6+ hours of direct sunlight per day for best results. Cloudy days are fine, as long as there aren't too many of them.
vcrewgambit Reviewed by vcrewgambit on . Sun needed? when counting how many hours of sun a plant need, like 18/6 or so, those it still count as a sun hour if the sun doesn't hit them directly, but it isn't totally dark? Rating: 5