Stinging nettle

Nettle seeds are called nuts and appear at the top of the plant in mid-summer. They are the size of a pinhead and there can be several thousand of them on a single plant.

An excerpt from the article 21 facts about Stinging nettle

 They are harvested between August and October. They contain vitamins A, B, C, potassium, iron, calcium, carotenoids and chlorophyll. They generally give energy and put you in a good mood.