Nothing. There is no difference.

Industrial Hemp refers to Cannabis sativa plant that has less than 0.3% THC by weight.

In the Industrial Hemp Regulations, industrial hemp includes Cannabis plants and plant parts, of any variety, that contains 0.3% tetrahydrocannabinol (THC) or less in the leaves and flowering heads.

When the Cannabis plant has less than 0.3% THC, the Farm Bill says it is Industrial Hemp and therefore legal to sell.

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