Giant seaweed

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Seaweed detail.png

Giant seaweed can be harvested from a seaweed patch at level 23 Farming after planting a seaweed spore. Planting gives 19 Farming experience and harvesting yields 21 experience for each giant seaweed picked. It takes approximately 40 minutes for it to fully grow. A minimum of three can be collected per patch, with the average being around 15–32 (if super or ultracompost is used) depending on one's Farming level.

The magic secateurs do not increase yield of giant seaweed.[1]

They can also be obtained by killing Lobstrosities.

Products[edit | edit source]

ItemMembersSkillsXPMaterials
Molten glass.pngMolten glass × 28.8
(Superglass make - giant seaweed)
Member icon.png
  • Crafting 61
  • Magic 77
  • Crafting 180
  • Magic 78
Soda ash.pngSoda ash × 6
(Giant seaweed)
Member icon.png
  • Cooking 1
  • Cooking 0

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.

Item sources[edit | edit source]

For an exhaustive list of all known sources for this item, see here (include RDT).
SourceLevelQuantityRarity
Lobstrosity68 Multicombat.png(noted)8/118
Seaweed (Farming) Grown Farming icon.png1Always

References[edit | edit source]

  1. Jagex. Mod Ash's Twitter account. 25 June 2018. (Archived from the original on 29 May 2020.) Mod Ash: "No, doesn't look like it. I guess you weren't expected to have them equipped down there."