This bill designates the Pediocactus nigrispinus, commonly referred to as the basalt cactus, snowball cactus, hedgehog cactus, or Columbia plateau cactus, as the official cactus of the state of Washington. A new section is added to chapter 1.20 of the Revised Code of Washington (RCW) to formalize this designation.

The inclusion of this new section highlights the state's recognition of the significance of the Pediocactus nigrispinus, promoting awareness and appreciation for this particular species within Washington's natural heritage.