1. (1) The life of a stand shall be unlimited as long as 75 percent of the plants present in the stand are those that were planted originally.
2. (2) To be eligible for the production of Certified class of seed, a field must not have grown or been seeded to the same species during the previous four years for Foundation, three years for Registered, and two years for Certified.
3. (3) A seed field inspection must be made the year of establishment and at least once each year that seed is to be harvested. This inspection will be made at a time when plant development allows for the detection of factors such as off-type varieties and weed contamination.

4. (4) Isolation for seed production the minimum distance from a different variety or wild hybridizing populations are as follows:

   	Minimum of isolation-feet:
   Class	Fields of 2 acres or less	Fields of more than 2 acres
   Foundation & Registered	400	200
   Certified	200	100

   Volunteer plants may be cause for rejection or reclassification of a seed field.

5. (5) Specific field tolerances:

   	Maximum ratio of heads or plants
   Purity	Foundation	Registered	Certified
   Other varieties & off-type	1/1000	1/500	1/250
   Other kinds (Inseparable other species)	1/2000	1/1000	1/500
   Prohibited noxious weeds	None found	None found	None found

[Statutory Authority: RCW 15.49.005, [15.49].021, [15.49].310, [15.49].370, 15.140.030, and chapter 15.49 RCW. WSR 25-09-035, s 16-302-465, filed 4/9/25, effective 5/10/25. Statutory Authority: RCW 15.120.030(3), 15.49.021, 15.49.310, and chapter 34.05 RCW. WSR 17-08-090, § 16-302-465, filed 4/5/17, effective 5/6/17. Statutory Authority: RCW 15.49.005, 15.49.081, 15.49.310, 15.49.370(3), and chapter 34.05 RCW. WSR 14-20-050, § 16-302-465, filed 9/25/14, effective 10/26/14. Statutory Authority: RCW 15.49.005, 15.49.081, 15.49.310, 15.49.370(3) and chapter 17.24 RCW. WSR 00-24-077, § 16-302-465, filed 12/4/00, effective 1/4/01.]