Hi Trudy,
No you can not save seed from florist's carnations.

Seeds can be stored in airtight containers, but only once the seed is very dry. Storing in paper envelopes works just fine.
Remy

Hi, I am a florist and once I had someone going through my garbage flowers hoping for seed. Once the flowers have been cut for so long they no longer have the nutrients for the seeds. Plus they're pumped full of preservative. If you purchased a carnation plant that would be different

Hmmmm.. I have a carnation plant with green flowers. I have never saved seeds before but would like to. how would I go about this?

Hi Glasslady,
You have to let the flowers die naturally on the plant. After flwoering, Tubular seed pods will develop. THey will be green at first and then turn tan as seeds inside them are almost ripe. When ripe, the tops will crack open. Inside you will find black chip type seeds.
Remy