Wash. Rev. Code § 15.160.020
(2) Except as provided in RCW 15.160.030, payment to the producer is due by the earliest of the following:
(3) Unless expressly provided otherwise in a turf seed production contract that is authenticated by the producer and turf seed dealer before the producer planting the turfgrass seed, the risk of loss and the responsibility for the payment of storage fees transfer from the producer to the turf seed dealer upon the earlier of:
(6) If a turf seed production contract is extended or renewed, for the extension or renewal period the parties may:
(7) A turf seed production contract may not:
[ 2025 c 117 s 2.]