91 Lemons x Blu Piff Sativa Blu Lemonade Piff is the offspring of two strains important to the Nimbus story. It is the cross of 91 Lemons (Chem 91 x Lemon Tree) and Blu Piff (Blue Dream x Piff). In this new strain, the parent genetics collide, creating an up-and-soaring high with a terpene profile that tastes like blue lemonade.