Seed Companies:
McKenzie, Berton, Fothergill's, Johnson's are all at big box hardware stores. Urban harvest is found in organic food stores.
Fothergill's has one of the best selection, especially when it comes to berry plants, but we may not get those here.
McKenzie is second best after that. But Mackenzie only has 3 squash varieties, and 3 pumpkins.
While Urban Harvest has 14 squash, 8 pumpkins, plus 3 or 4 summer squash, all very unique varieties.
Fothergill has about a dozen varieties of squash plus a few summer squash, though most of them are different types of butternuts.
They only have about 2 varieties that are unique and interesting(polar bear, crown prince).
Johnson sells half a dozen squash and only 1 interesting variety (coquina inca gold f1).
McKenzie stopped selling mustard such as Mizuna for 2019 season. Johnson's has a half dozen squash varieties.
Urban Harvest is selling about 8 kinds of Mustard including Mizuna this year, plus 4 or more salad mixes including mustard.
Berton's only has 1 pumpkin variety. It is also focused on Italian greens.
List of Heirloom Organic Non-GMO Seed companies
Peppers:
Sunshinefarm
Superseeds
Southernexposure
rareseeds