This page gives instructions on how to buy heirloom seeds from David's Garden Seeds.
Heirloom seeds are seeds that are at least 70 years old. (In my opinion) There are no governing rules for what makes a seed an heirloom.
Because of this, some companies will claim that all their open-pollinated seeds are heirlooms, even if they have been developed within the last few years or so. I think this is wrong.
So do your own home work. Make sure when they say it is "heirloom" it really is.
David’s Garden Seeds, gardening is our passion. We provide top quality
non-GMO seeds so families can learn to garden and love it. In turn, we
hope they will pass this passion down to their children and
grandchildren, teaching them to grow delicious food, fresh herbs, and