At most, Tyson has a green-ish thumb.
He can - with tender love and care - nurture a plant back to life from the brink of death. However, it’s almost always his fault that the plant was in that state, having allowed it to fade into the back of his mind as mere décor. He’ll restore the plant back to health, and then the cycle will repeat.
Tyson is a city mouse through and through. Truth be told, he prefers to experience nature from afar or in small quantities. He loves London’s many parks and the family manor’s grounds, but he’ll always favour pockets of nature within a city over the countryside.
However, if shown a tree leaf, Tyson can very reliably identify it. The same applies to which berries, mushrooms, et cetera are safe to eat: for people and for dogs. He couldn’t do this everywhere in the world, but Tyson has Britain’s flora memorised, and large areas of both Europe and the Middle East committed to memory too.