Burpee Seeds

Best variety choices, good cultural information
http://www.Burpee.com

Clyde Robin Seed Company

Wildflower seeds
http://www.clyderobin.com/

Heirloom seed varieties and imported gourmet seed
http://www.gourmetseed.com

Ask about a 20% discount on seeds for school gardens
http://www.johnnyseeds.com/

California native seeds of wildflowers, grasses shrubs, vines and trees
http://www.larnerseedss.com/

Herbs and butterfly plants
http://www.mountainvalleygrowers.com/

Wholesale nursery specializing in San Diego native plants. Formerly RECON Native Plants.  Ask for school donations or discounted prices.https://nativewest.com

Wholesale prices for school gardens
http://www.parkseed.com

Gourmet vegetable, herb, and flower seeds
https://www.reneesgarden.com

Locally produces sustainable vegetable seeds and companion flower seeds
https://www.sandiegoseedcompany.com

Heirloom and drought tolerant seeds
http://www.seedsofchange.com

Family run company specializing in heirloom and organic seeds
https://sustainableseedco.com

Heirloom and organic seeds
http://www.territorial-seed.com

Large selection of tomato varieties but also has other hybrid and heirloom vegetable seeds
https://www.tomatogrowers.com

Tomato plants and seeds in addition to other fruits and vegetables
https://www.totallytomato.com/category/4

Heirloom and organic vegetable and tomato seeds
http://www.vegetableseedwarehouse.com/