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Underwater seaweed patch runs: farming giant seaweed

Recurring Moderate Members Ironman-friendly Timer-limited

−6,540GP/hr
22KCapital to start (~1 hour of inputs)
−2,180/dayTimer-limited: 5 runs × 4 min/day

Plant a seaweed spore with ultracompost in each of the two underwater patches, then come back about 40 minutes later to harvest the giant seaweed. Only two patches, so it is best tacked onto other Fossil Island activities.

Requirements

  • Skills: 23 Farming
  • Quests: Bone Voyage
  • Items: Fishbowl helmet, Diving apparatus
  • Note: Two seaweed patches on the seabed off Fossil Island; the Fossil Island Elite diary is not needed. Assumes a digsite pendant for travel.

How to do it

Method rates and requirements here are independently authored. For the step-by-step guide, see the OSRS Wiki page (CC BY-NC-SA 3.0).

The math (per hour)

ItemQty/hrUnitTotal1h volume
Giant seaweed24064+15,36027,475
limit 11,000/4h
Seaweed spore30230−6,9003,822
limit 600/4h
Ultracompost30500−15,00020,629
limit 2,000/4h
Revenue15,360
Costs−21,900
Profit / hour−6,540

Sell prices are after 2% GE tax (capped at 5M, items under 50 gp exempt). Inputs use the instant-buy price, outputs the instant-sell price — the conservative assumption. Buy-limit cap: none.

Prices updated 1 min ago. Figures are estimates: buy at instant-buy price, sell at instant-sell price after 2% GE tax.

Something wrong?

Rates, requirements or items off? Email us and we'll fix the data. Current figure: 30 actions/hr.