I think it depends on what you mean by seedling and under watering. When they are and inch or two high or less, I strive for maintaining even moisture. As they get larger, I like to thoroughly water them, then let them dry out to just before they start to wilt before watering again. The timing of watering is a guess because that time shortens as the plant gets bigger and the fan blows on them more. Probably 2-3 times a Spring, they get to the point of starting to wilt before I water. With a good drink, they pop back up in no time. Personally, I think keeping them in cool temps, using a fan on them and letting them go from wet to dry are stressors that result in a thicker stalked, stronger plant. That is pure observation and not scientific at all, but, it works for me.
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