Section 14552 Of Article 2. Definitions From California Food And Agricultural Code >> Division 7. >> Chapter 5. >> Article 2.

. "Packaged soil amendment" means any substance distributed for the purpose of promoting plant growth or improving the quality of crops by conditioning soils solely through physical means. It includes all of the following:
  (a) Hay.
  (b) Straw.
  (c) Peat moss.
  (d) Leaf mold.
  (e) Sand.
  (f) Wood products.
  (g) Any product or mixture of products intended for use as a potting medium, planting mix, or soilless growing media.
  (h) Manures sold without guarantees for plant nutrients.
  (i) Any other substance or product which is intended for use solely because of its physical properties.