While most potent marijuana can be measured in a lab it is much more of a subjective factor that often decides what strain is more 'potent' for an individual. It becomes a personal assessment rather than just a clinical number that would decide that.

Potent marijuana strands include Indicas and Sativas. Sativas potent weed strains give a cerebral high.

Sativas Powerful Marijuana Include:

• Durban Poison
• Northern bright

Indica Potent Weed:

• Afghan
• Northern Lights
• White Widow (White Widow is a personal recommendation. Potent, strong and pleasant high I've personally ever had).
• White Rhino
• Hash Plant
• Warlock

Grown properly these are some of the strongest strains. But remember, if you want the most potent strongest marijuana, you'd rather grow Indicas, which are known to have a higher resin production with a higher concentration of THC and CBDs. Indicas are also best for making hashish. Hash Plant is one of my favorites.

But it's a matter of taste. THC levels of White Widow can be around 20% if grown properly. G13 is said to be 25% THC, so if you're willing to invest, Mr. Nice G13 x Hash Plant of Sensi Seeds is a good choice.