Seaweed

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Seaweed detail.png

Seaweed is an item dropped by creatures near water like Rock Crabs. It can be used with a fishbowl that is full of water so that you can catch a fish in the Catherby aquarium. Seaweed can be used for normal compost.

Seaweed can be cooked on a range or fire to create soda ash, an ingredient for molten glass, but this awards no xp. 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.

Collecting 5 seaweed from anywhere on Karamja is an easy task of the Karamja Diary.

Uses - Comparing Molten Glass yield and XP[edit | edit source]

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. You can however fail, resulting in only one soda ash. Note that Cooking gauntlets do not decrease the cooking fail chance, however the Hosidius Kitchen cooking range effect still applies.

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[edit | edit source]

ItemMembersSkillsXPMaterials
Ground seaweed.pngGround seaweed
Member icon.png
  • Cooking 1
  • Cooking 1
Molten glass.pngMolten glass × 16.9
(Superglass make - seaweed)
Member icon.png
  • Crafting 61
  • Magic 77
  • Crafting 130
  • Magic 78
Soda ash.pngSoda ash
(Seaweed)
Member icon.png
  • Cooking 1
  • Cooking 0

Item sources[edit | edit source]

For an exhaustive list of all known sources for this item, see here (include RDT).
SourceLevelQuantityRarity
Ammonite Crab25 Multicombat.png1–28/128
Ammonite Crab25 Multicombat.png52/128
Baby impling jarN/A Casket.png11/100
Baby impling Hunter icon.png11/100
Cave kraken127 Multicombat.png30 (noted)6/200
Dagannoth (Waterbirth Island) Level 8888 Multicombat.png1–1030/128
Dagannoth spawn42 Multicombat.png110/128
Dagannoth74; 92 Multicombat.png102/128
Fishing spot (big net, harpoon) Fishing icon.png1Uncommon
Giant Sea Snake149 Multicombat.png52/128
Giant lobster (Ghosts Ahoy)32 Multicombat.png1Always
Giant lobster45 Multicombat.png14/128
Giant lobster45 Multicombat.png24/128
Giant lobster45 Multicombat.png52/128
Ice troll female Variant 1 Multicombat.png3–9 (noted)10/128
Ice troll grunt Variant 1 Multicombat.png3–9 (noted)10/128
Ice troll male Variant 1 Multicombat.png3–9 (noted)10/128
Ice troll runt Variant 174 Multicombat.png3–9 (noted)10/128
Kraken291 Multicombat.png125 (noted)3/128
Lobstrosity68 Multicombat.png(noted)8/118
Mogre60 Multicombat.png12/128
Reward poolN/A Casket.png20–60 (noted)4/160
Rock Crab13 Multicombat.png14/128
Rock Crab13 Multicombat.png24/128
Rock Crab13 Multicombat.png52/128
Rock lobster127 Multicombat.png1–310/128
Sand Crab15 Multicombat.png14/128
Sand Crab15 Multicombat.png24/128
Sand Crab15 Multicombat.png52/128
Sea Snake Hatchling62 Multicombat.png52/128
Sea Snake Young90 Multicombat.png52/128
Swamp Crab55 Multicombat.png2–84/128
Waterfiend115 Multicombat.png20–30 (noted)2/128

Spawns[edit | edit source]

Location Members Spawns Map
Karamja - all around the east and west coastMember icon.png30Maplink
Mos Le'Harmless - islands off the north-east coastMember icon.png4Maplink
Entrana - north-western coastMember icon.png10Maplink
Kourend - all around the east and south coastMember icon.png60Maplink
Fremennik Province - north of Keldagrim entranceMember icon.png9Maplink

Shop locations[edit | edit source]

This list was created dynamically. For help, see the FAQ. To force an update of this list, click here.
SellerLocationNumber
in stock
Restock
time
Price
sold at
Price
bought at
Members?
Dom Onion's Reward ShopYanilleN/A200N/AMember icon.png
Trader Stan's Trading PostCatherby201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostPort Tyras201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostBrimhaven201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostPort Sarim201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostPort Phasmatys201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostCorsair Cove201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostPrifddinas201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostMos Le'Harmless201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostShip Yard201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostPort Khazard201m Coins 5.png 5Coins 1.png 0Member icon.png
Trader Stan's Trading PostMusa Point201m Coins 5.png 5Coins 1.png 0Member icon.png

Other sources[edit | edit source]