You can buy seeds from the Supplies shop.

if you have already pollinated all of them, no

you can however look to buy seeds from the supply shop to get some of the lvl 1 seeds back

Yeah i done that and i have none left see what happens when i get frustrated

The Supplies shop will restock every 24 hours.

oh really i never knew that well thank you for the info, back to testing

in the beginning i try to keep my original seeds kind of more organized, and when i realize i am down to my last seed of a particular type, i use its own pollen to pollinate it and stock back up on the seeds

if i have room, i set aside one of each kind in the lower right corner of the seed box so i don't accidentally use the last one