THC is an abbreviation for the chemical Tetrahydrocannabinol, a psychoactive compound contained within Marijuana which is responsible for producing the 'highs' experienced when using the drug. The Cannabis seeds in our high THC category have a minimum THC concentration of 15%. It is often the case that seeds of a higher THC constitution produce a lower yield. It is important to note that any Cannabis seeds sold on this site are intended for collector’s purposes only. Cultivation is not condoned in countries where growing cannabis is illegal.