kylaluaz said: ... And I remember one person, somewhere, writing about winter sowing, who recommended rather fiercely that everybody just remove the hats, the lids, entirely, as soon as anything sprouted. Tough love! she would say.
Well... nope.
I know I'm a broken record on this subject, but: what works well in one climate may be a disaster in another climate, and vice-versa.
If your springs are usually a fairly steady or rapid progression from "cold" through "cool" to "warm", and you know how much shade to provide in your micro-climate, a rule like "remove lid after emergence" might be a good bet.
If you tend to have erratic and unpredictable swings from cold to warm and back to cold, the only possible rule might be: "watch like a hawk and adapt on the fly".
Finding one rule that fits all gardening circumstances would be like finding one shoe that fits all feet!
