Hi please excuse my ignorance as a total amature gardner but my ornamental cabbages are blooming like crazy little yellow flowers (that the bumble bees love) and I would like to harvest the seeds but I don't know what ARE the seeds. Are they the little spindly thread like things that are leftover after the bloom falls off? Also, when should I plant them? Do they need a rest? I'd love to have some for this fall. Thanks for any help.