The black insects were probably aphids but the larvae are not theirs. I wouldn't cover it, I'd keep digging it over to let the birds get at the larvae, whatever they were.
I think most plants, except for tender ones, are better outside
I should think annuals would go until the bamboo makes a bid for world domination
If you've got a good clump of leaves you'll get flowers this year, if you can't see anything they were probably biennial. They're 99% biennial for me.
It all happens here Alan
I hope they do well for you flowers
I shall only be a little bit jealous if they do well for you and Dove
Eric is a hybrid, I can keep him going but not niger
Mine don't fall over till the seed heads form, these are very heavy and sometimes the stem breaks with a spectacular crack