Rumberry seeds can be found rarely while harvesting rumberry bushes (approximately 1 seed per 50 rumberries). There is also a rare chance of obtaining a seed when pickpocketing cyclops on Cyclosis (requiring 88 Thieving). They can be planted in the berry planter at the centre of Tuai Leit with level 86 Farming to produce rumberries, or sold at Ani's Seed Store by the Sea Shore on Tuai Leit for 3 chimes each.