i think i’ve seen this seed before in a historical museum in ireland. The seeds used to wash on the shore in the old days, and were considered to have medicinal or magical properties. Seems they can travel a long way by sea.
"Sadhana is practiced...wherever a pure, serene atmosphere can be found." Achieve steadiness, control of emotions through abhyasa-regular consistent practice with devotion, yoga-the restraint of mental activities and vairaghya-dispassion. Like the growth of a kauri tree, it's a slow process; check it every few years, see the progress.