I'm still looking for suggestions please, how cold is too cold for broad beans, and requires covering up?
The website which suggests hardiness down to -10 °C sounds too optimistic, but I'm thinking I don't need to cover them yet, four nights from now, when it's forecast to dip to -2 °C overnight.
For outdoor plants (my only option), when would you cover them up? When would you not bother?
FWIW, some of mine are 8 inches tall now, others are still mere sprouts, just peeking above the soil.