Marijuana Potency And/Or Press

For definitive references on the cultivation and chemistry of marijuana, see MARIJUANA GROWERS GUIDE, And/Or Press (1978) and MARIJUANA POTENCY, And/Or Press (1977). 

A more recent study [II Farmaco. Ed. Sci. 841-53 (1979)] has shown that some polyploid phmts (produced by treating young plants with 0.5 percent colchicine) can have about twice the THC concentration of untreated plants but total I yield per plant is probably less. This, coupled with the facts that many plants die, that higher potency plants will probably not breed true and that colchicine is poisonous make it doubtful that such treatment is worth the effort. For further discussion see Clarke s excellent Marijuana Botany (And/Or Press, 1981). For a recent Russian paper on the botany of hemp polyploids see Genetika (English Edition) 15,204(1979). 

---