Is there a difference in the UK law of growing cannabis and hemp plants?

Hemp plants and cannabis are from the same species, but there is one major difference between them. While hemp plants have a low THC percentage, usually under 0.03%, cannabis has THC percentage of more than 0.03%. Even if you grow plants with no THC at home, it would be illegal under the UK law. You can not grow any such plants at home, but you can grow them for business with a legal home office license.