Seaweed spore

"Spores" redirects here. For the spores used to grow mushrooms, see mushroom spore.

Seaweed spore
Released							7 September 2017 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							Yes
Equipable							No
Stackable							Yes
Destroy							Drop
Examine							A seaweed spore - plant in a seaweed patch.
Values
Value							20 coins
High alch							12 coins
Low alch							8 coins
Weight							0 kg
Grand Exchange
Exchange							468 coins (info)
Buy limit							600
Daily volume							19,450
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Advanced data
Item ID							21490

Seaweed spores are used in the Farming skill and require level 23 in the skill to grow them. They are planted at the seaweed patch in the underwater area of Fossil Island and provide giant seaweed when harvested. Players can pay Mernia to protect this patch by giving her 200 numulites.

Giant seaweed is often grown by players for Tangleroot due to the relatively high chance of obtaining it compared to the seaweed spore growth time, as well as by ironmen for its use in Crafting.

Sources

Seaweed spores can be obtained via the following methods:

• They may randomly appear when diving in shallow water within the underwater area beneath Fossil Island. 1-3 seaweed spores can spawn, and they will despawn in 30 seconds. Like marks of grace, they appear individually for each player. However, unlike marks of grace, if you log out, they will disappear instantly and they will not be there when you log back in. When they spawn, they release a cloud of bubbles, and all players whose spores spawn on that tick will spawn at the same tile.
  • Spawns of seaweed spores seem to be based around the amount of time a player has been logged in. The moment of spawning always seems to be around a whole-minute amount of time since logging in. This is a similar mechanism to the 5-minute timer used by Farming cycles and random event spawn timers.
• They can be obtained from ammonite crabs, lobstrosities and Fossil Island Wyverns.
• They can be purchased from Mairin's Market in exchange for 20 mermaid's tears per spore.
• They can be pickpocketed from Master Farmers.

Farming info

Seaweed
Level required				23
Patch				Seaweed
Seeds per				1
Payment				200 Numulites
Growth time				40 min (4x10 min)
Yield				3+ (varies)
Regrow				No
Navigation
Seed				Seaweed spore
Plant				Seaweed
Crop				Giant seaweed
Experience
Planting XP				19 xp
Checking XP				No
Harvesting XP				21 xp

Item sources

For an exhaustive list of all known sources for this item, see here (include RDT).

Source	Level	Quantity	Rarity
Ammonite Crab	25	2	1/128
Ancient Wyvern	210	16–24	2/132
Lobstrosity	68	5	6/118
Long-tailed Wyvern	152	12	2/123
Master Farmer	38	1	1/2,200
Spitting Wyvern	139	12	2/123
Taloned Wyvern	147	12	2/123

Shop locations

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Seller	Location	Number in stock	Restock time	Price sold at	Price bought at	Members?
Mairin's Market	Underwater	100	6s	20	N/A

Average yield per level

	Base	Compost	Super	Ultra
23	8.26	11.01	13.76	16.52
30	8.63	11.51	14.38	17.26
40	9.25	12.34	15.42	18.51
50	10.11	13.47	16.84	20.21
60	10.97	14.63	18.29	21.94
70	12.00	16.00	20.00	24.00
80	13.24	17.66	22.07	26.48
90	14.77	19.69	24.62	29.54
99	16.70	22.26	27.83	33.39

Changes

Date	Changes
16 September 2020 (update | poll)	Seaweed spores were added to Master Farmers' loot table.
21 March 2019 (update)	The item was graphically updated to stand out easier underwater.
31 May 2018 (update)	The cost of seaweed spores in Mairin's Market was lowered from 50 to 20 mermaid's tears.

Gallery (historical)

7 September 2017 – 21 March 2019
21 March 2019 – present