This directory brings together California suppliers, seed sources, and testing labs in one place, so you can spend less time tracking down organic-approved inputs and more time farming.
This resource was last updated August 11th, 2026.
What’s inside
- Agricultural Supply Companies: Businesses across California carrying organic amendments, compost, farm supplies, fertilizer, irrigation supplies, manure, mulch, organic pest control, organic poultry feed, packing supplies, potting soil, and soil.
- Organic Seed, Transplant, and Nursery Stock Suppliers: Where to buy organic seed, transplants, and nursery stock in California and beyond.
- Lab Testing Facilities: Labs that conduct soil, tissue and/or water testing.
Know before you buy
Being sold as “organic” isn’t enough. To comply with organic regulations, organic farmers must use materials that are:
- OMRI listed and/or registered with CDFA as an Organic Input Material
- Approved by your certifier prior to use
- Added to your materials list
Look for these logos on products
Helpful Tools
Recommended Device Views
Each section below has two main viewing options: List View and Gallery View.
- List View shows up as a table and is best suited for users on a computer.
- Gallery View shows up as business card for each business and is best suited for users on a mobile device.
Agricultural Supply Companies and Lab Testing also have a Map View, which plots each business by address.
To switch views, look for the options just below the section header:
