Nasturtium

Nasturtium is a flower produced in the Farming skill. To plant it, you need a farming level of 24, have a nasturtium seed and a seed dibber in your inventory. Nasturtiums protect watermelons from disease when fully grown.

When you plant it you get 19,5 experience, when you pick it you get 111 experience, a total of 130,5 experience per nasturtium.