Frost

Several of my marigold seedlings definitely seem to have got frosted last night (they look like frozen lettuce).
I'm distinctly surprised, as I thought they were hardy -- I'm pretty sure the adult plants have actually survived snow, which the poppies didn't -- and these were some of the most well developed of the various species that have germinated, with several sets of true leaves each. Also, other marigolds in the very same pots are still fine.

Nothing else that was outside seems to have taken any damage, but it does suggest that I was wise to take in the possibly-basil and possibly-mesembryanthemum pots overnight...

Slugs!

Evidently I was wrong about the Great Slug War -- having brought the strawberry pot in overnight in case of frost, I found three slugs in it simply because I could literally hear them busy eating. There are probably more nestled in amongst the stiff stems of the crown that I didn't find... (although if they had been eating at that rate for long I doubt I'd have many strawberry leaves left).

[Edit: just went up to check a couple of hours later and another pea-sized one had emerged]