Tom Clothier’s Garden Walk and Talk
Tom Clothier has a number of seed germination databases on a wide range of plant types: annuals, biennials, perennials, shrubs, and even a dedicated Penstemon germination database! He also has several articles, and an index for Norm Deno’s works.
Alplains is run by Alan Bradshaw in Colorado. In addition to providing a great seed catalogue containing many western natives, his site is also a great resource for germination requirements of many plants.
Propagation Books and Articles
Propagation by Seed Handout
by Rebecca Lance
A short handout that summarizes a few seed propagation ideas and methods that were discussed at SRGS workshops/meetings 2023.
Seed Propagation of Native California Plants
By Dara Emery
This is an indispensable book for those interested in growing native California plants from seed. Dara discusses numerous strategies for seed propagation and then offers a very extensive list of many native California plants with recommended seed treatment for each species.
Seed Germination Theory and Practice
by Norm Deno
This is a great resource for the propagation geek. Norm Deno describes many mechanisms that trigger seed germination. He then describes germination patterns and requirements for many plant genera, including lots of rock garden plants. He published two supplements to the first volume, which include even more plant species. These are no longer in print, but pdf versions are now available for free through the USDA.