Black Pearl is 70% Sativa dominant Hybrid is a cross between Blackberry, Blueberry, and Skunk. Black Pearl’s hard hitting exotic beauty that will give you instant pain relief that will last all day while keeping you mentally alert. Black Pearl has quickly gained the attention of medical patients will a wide range of ailments. She is known as a “Humboldt Heirloom” strain due to it’s wonderful genetics that were crafted with care. Some seed banks are billing Black Pearl Strain as a “new generation of super strains”. Growing is relatively easy, flowering times are 9-10 weeks with plant height topping off at about 5 feet. Black Pearl.