Looking for Cannabis or Marijuana Flower Shake? StrainwisePR has a large selection of Marijuana and Cannabis Flower Shake in San Juan Puerto Rico. What Is Marijuana Shake? Shake consists of small pieces of the cannabis flower that have broken off the full flower bud. Shake can be found at the bottom of cannabis dispensary jars filled with flower buds or the bag that holds your purchased bud. Looking to stay on the cheap? Shake is your cheaper alternative.