I'm a novice gardener and have put some trays of marigold seeds in the garden. Last night, we had unforecast frost. It wasn't a heavy frost, and only appeared in small patches on the grass in the garden. If it's relevant, this is in the UK. The species are: French Dwarf, Bonita and Honeycomb.
Are my marigolds likely to have survived this, or do I need to clear out my trays and start again?