LOCAL OSRS REFERENCE

Seaweed

Source revision 15285581 · Saved 2026-09-27 · Sources & credits

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Seaweed
Released18 March 2002 (Update)
MembersYes
Properties
TradeableYes
EquipableNo
StackableNo
NoteableYes
OptionsDrop
ExamineSlightly damp seaweed.
Values
Value2 coins
High alch1 coin
Low alch0 coins
Weight0.2 kg
Respawn time100 ticks (60 seconds)
Grand Exchange
Exchange5 coins (info)
Buy limit13,000
Daily volume174,290
View real-time prices
Advanced data
Item ID401
LinkMOID

Seaweed is an item dropped by creatures near water, like rock crabs. It can also be obtained from Fishy salvage. It can be used with a filled fishbowl to catch a fish in the Catherby aquarium, or be cooked on a range or fire to create soda ash. Seaweed may also be used in place of soda ash in the superglass make Lunar spell, skipping the need to convert it to soda ash. Seaweed can be used for normal compost.

Uses

Achievement Diary

Comparing Molten Glass yield and XP

When using soda ash and buckets of sand in a furnace the molten glass yield is

1.0 molten glass per soda ash and bucket of sand.

When using Superglass Make with soda ash and buckets of sand the molten glass yield is

1.3 molten glass per soda ash and bucket of sand.

When used on a fire, giant seaweed turns into six soda ash upon successfully cooking, rather than just one given by normal seaweed. Players can however fail, resulting in only one soda ash. Note that Cooking gauntlets do not decrease the cooking fail chance but the Hosidius Kitchen cooking range effect does.

When used in conjunction with the Superglass Make spell, giant seaweed similarly acts as six regular seaweed and gives 60 Crafting experience per seaweed when cast. The combination of two giant seaweed and 12 buckets of sand yields on average 1.45 molten glass per bucket of sand, while the combination of three giant seaweed and 18 buckets of sand yields an average of 1.6 glass per sand, although with the latter some of the glass will fall on the floor as it overflows from the inventory. If it is not picked up, it results in an average of 1.488 glass per sand. If players obtain the sand via mining sandstone, it is slightly more efficient to not pick up the excess despite the lower return due to how quickly the materials can be obtained.

The average Crafting experience per giant seaweed varies:

  • For an average of 1.45 glass per sand (two giant seaweed and 12 buckets of sand), each giant seaweed equals 538.5 experience when making lantern lenses or 669 experience when making empty light orbs;
  • For an average of 1.488 glass per sand (three giant seaweed and 18 buckets of sand without picking up the excess), each giant seaweed equals 551 experience when making lantern lenses or 685 experience when making empty light orbs;
  • For an average of 1.6 glass per sand (three giant seaweed and 18 buckets of sand and picking up the excess), each giant seaweed equals 588 experience when making lantern lenses or 732 experience when making empty light orbs.

These numbers include the experience from casting Superglass Make.

Products

ItemMembersSkillsXPMaterials
Fishbowl (seaweed)
Members
  • None
  • None
Ground seaweed
Members
  • Cooking 1
  • Cooking 0
  • 1 × Seaweed
Makeshift bandages
Members
  • None
  • None
Molten glass × 16.9
(Superglass Make - seaweed)
Members
  • Crafting 61
  • Magic 77
  • Crafting 130
  • Magic 78
Seaweed sandwich
Members
  • None
  • None
Soda ash
(Seaweed)
Members
  • Cooking 1
  • Cooking 0
  • 1 × Seaweed
Stuffed monkey
Members
  • None
  • None

Item sources

SourceLevelQuantityRarity
Rock Crab13 14/128
Rock Crab13 24/128
Rock Crab13 52/128
Ice troll grunt100 3–9 (noted)10/128
Dagannoth74; 92 102/128
Waterfiend115 20–30 (noted)2/128
Mogre60 12/128
Giant lobster45 14/128
Giant lobster45 24/128
Giant lobster45 52/128
Sea Snake Hatchling62 52/128
Sea Snake Young90 52/128
Baby impling17; 27 11/100
Baby impling jarN/A 11/100
Dagannoth spawn42 110/128
Rock lobster127 1–310/128
Giant Sea Snake149 52/128
Cave kraken127 30 (noted)6/200
Kraken291 125 (noted)3/128
Ice troll female Variant 182 3–9 (noted)10/128
Ice troll runt Variant 174 3–9 (noted)10/128
Dagannoth (Waterbirth Island) Level 8888 1–1030/128
Giant lobster (Ghosts Ahoy)32 1Always
Ice troll male Variant 182 3–9 (noted)10/128
Sand Crab15 14/128
Sand Crab15 24/128
Sand Crab15 52/128
Aquanite145 110/128
Lobstrosity68 6 (noted)8/118
Ammonite Crab25 1–28/128
Ammonite Crab25 52/128
Swamp Crab55 2–84/128
Fishing spot (big net, harpoon) Big net16 1Uncommon
Reward poolN/A 20–60 (noted)1/40
Net SeaweedN/A 1Always
Stingray92 10–15 (noted)3/100
Fishy salvage26 140/467
Hermit crab19 12/128
Dolphin22 3–5 (noted)10/50
Elder aquanite305 13 × 1/13
Mogre (sea)54 116/128
Butterfly ray68 10–15 (noted)6/149
Eagle ray44 10–15 (noted)14/150
Manta ray (monster)133 10–15 (noted)5/99
Boat fishing spot (big net, harpoon) Big net16 1Uncommon

Spawns

This article or section is incomplete and could do with improvement.
Reason: Missing Isle of Serpents spawns
You can give feedback, discuss this issue on the talk page, or edit this article to improve it.
Location Members Spawns Map
Karamja - all around the east and west coastMembers29Show map
Mos Le'Harmless - islands off the north-east coastMembers4Show map
Entrana - north-western coastMembers10Show map
Kourend - all around the south-east coastMembers60Show map
Fremennik Province - north of Keldagrim entranceMembers9Show map
Isle of SoulsMembers17Show map
Varlamore - east coastMembers16Show map
Varlamore - south coastMembers6Show map
Shipwreck Cove (one requires telegrab)Members14Show map
Around Salvager Overlook[1]Members6Show map
North of Darkmoon Ravine (1 telegrabbable, rest inaccessible)Members3Show map
South of Darkmoon Ravine (inaccessible)Members3Show map
Tear of the SoulMembers6Show map
Cape ConchMembers13Show map
Charred IslandMembers10Show map
Remote IslandMembers6Show map
Dognose IslandMembers4Show map
Red Rock (inaccessible)Members4Show map
  1. ^ These spawns require telekinetic grab to obtain. One is not reachable.

Shop locations

SellerLocationNumber
in stock
Restock
time
Price
sold at
Price
bought at
Change
Per
Members
Trader Stan's Trading Post (1)Port Sarim201m 5 02.0%Members
Trader Stan's Trading Post (2)Port Phasmatys201m 5 02.0%Members
Trader Stan's Trading Post (3)Musa Point201m 5 02.0%Members
Trader Stan's Trading Post (4)Brimhaven201m 5 02.0%Members
Trader Stan's Trading Post (5)Port Khazard201m 5 02.0%Members
Trader Stan's Trading Post (6)Corsair Cove201m 5 02.0%Members
Trader Stan's Trading Post (7)Port Tyras201m 5 02.0%Members
Trader Stan's Trading Post (8)Catherby201m 5 02.0%Members
Trader Stan's Trading Post (9)Prifddinas201m 5 02.0%Members
Trader Stan's Trading Post (10)Mos Le'Harmless201m 5 02.0%Members
Trader Stan's Trading Post (11)Karamja Shipyard201m 5 02.0%Members
Trader Stan's Trading Post (12)Land's End201m 5 02.0%Members
Trader Stan's Trading Post (13)Port Piscarilius201m 5 02.0%Members
Trader Stan's Trading Post (14)Civitas illa Fortis201m 5 02.0%Members
Trader Stan's Trading Post (15)Sunset Coast201m 5 02.0%Members
Trader Stan's Trading Post (16)Aldarin201m 5 02.0%Members
Trader Stan's Trading Post (17)The Pandemonium201m 5 02.0%Members
Trader Stan's Trading Post (18)The Summer Shore201m 5 02.0%Members
Trader Stan's Trading Post (19)Deepfin Point201m 5 02.0%Members
Trader Stan's Trading Post (20)Port Roberts201m 5 02.0%Members
Trader Stan's Trading Post (21)Red Rock201m 5 02.0%Members
Dom Onion's Reward ShopYanille∞N/A200N/A0.0%Members
Durrik's GoodsDeepfin Mine101m 5 02.0%Members

Sources & credits

“Seaweed” by Old School RuneScape Wiki contributors, revision 15285581. Text adapted under CC BY-NC-SA 3.0; adapted text is shared under the same license. Formatting and navigation changed; Wiki scripts and editing controls omitted. Game imagery © Jagex Ltd. Imported image-file descriptions retain their own credits and licensing statements.

Original source address: https://oldschool.runescape.wiki/w/Seaweed?oldid=15285581

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About this library and media credits

Game icons © Jagex Ltd, via the OSRS Wiki. Interface icons by Lucide.