Buy Supa Grow Kits 98.99% McKennaii – Bend. Psilocybe Cubensis McKennaii is said to be an even stronger strain than the popular and famous (and hard to cultivate) Copelandia cyanescens. It definitely is for the more experienced, visually interested psychonauts due its very philosophical trip with a strong visual component. This grow kit contains a 98.99% colonized 1200ml cake. If you have been looking for the best place to order this strain, Mandy’s psychedelics got you covered. If you have any question about this strain, just contact our customer service and you will get answers.