Cosmos seeds may last between three and four years in a cool, dry environment, so your grandmother’s seeds may still be viable. It’s worth giving them a try, in any case! Maybe buy a supplemental packet, too, if you can.
As for your hanging baskets: It’s a tad late to be starting most flowers from seed, unfortunately, however you do have a couple options. Pansies are probably your best bet if you want to start from seed. You may be able to find a few cheap impatiens, portulaca, and petunia transplants on sale at this time, too.
Cosmos seeds may last between three and four years in a cool, dry environment, so your grandmother’s seeds may still be viable. It’s worth giving them a try, in any case! Maybe buy a supplemental packet, too, if you can.
As for your hanging baskets: It’s a tad late to be starting most flowers from seed, unfortunately, however you do have a couple options. Pansies are probably your best bet if you want to start from seed. You may be able to find a few cheap impatiens, portulaca, and petunia transplants on sale at this time, too.