Seaweed spore

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

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. Players can pay Mernia to protect this patch by giving her 200 numulites.

Once fully grown, which takes approximately 40 minutes, players will be able to harvest giant seaweed. A minimum of three can be collected per patch, with the average being around 15–30 (if super or ultracompost is used; 8-16 if compost is not used), depending on one's Farming level. Specifically, the patch has three "lives" by default, and each tier of compost adds one extra. The chance to not consume a life upon harvest is 64.1% at level 23 and 82% at level 99, using linear interpolation for other levels.[1] Magic secateurs and the farming cape do not have an effect.[2]

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[edit | edit source]

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.
  • 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[edit | edit source]

Seaweed spore
Level required Farming 23
Patch Seaweed
Seeds per 1
Payment 200 Numulites
Growth time 40 min (4x10 min)
Yield 3+ (varies)
Regrow No
Seed Seaweed spore 5.pngSeaweed spore
Plant Unknown (edit)
Crop Giant seaweed.pngGiant seaweed
Planting XP 19 xp
Checking XP No
Harvesting XP 21 xp

Growth stages[edit | edit source]

Stage Image Diseased Dead
1 Giant seaweed stage 1.png N/A N/A
2 Giant seaweed stage 2.png Giant seaweed stage 2 (diseased).png Giant seaweed stage 2 (dead).png
3 Giant seaweed stage 3.png Giant seaweed stage 3 (diseased).png Giant seaweed stage 3 (dead).png
4 Giant seaweed stage 4.png Giant seaweed stage 4 (diseased).png Giant seaweed stage 4 (dead).png
5 Giant seaweed stage 5.png N/A N/A

Item sources[edit | edit source]

For an exhaustive list of all known sources for this item, see here (include RDT).
Ammonite Crab25 Multicombat.png21/128
Ancient Wyvern210 Multicombat.png16–242/132
Lobstrosity68 Multicombat.png56/118
Long-tailed Wyvern152 Multicombat.png122/123
Master Farmer38 Thieving icon.png11/2,200
Spitting Wyvern139 Multicombat.png122/123
Taloned Wyvern147 Multicombat.png122/123

Shop locations[edit | edit source]

This list was created dynamically. For help, see the FAQ.
To force an update of this list, click here.
in stock
sold at
bought at
Mairin's MarketUnderwater1006sMermaid's tear 5.png 20N/AMember icon.png

Average yield per level[edit | edit source]

Farming 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[edit | edit source]

Date Changes
16 September 2020
(update | poll)

Seaweed spores were added to Master Farmers' loot table.

31 May 2018

The cost of seaweed spores in Mairin's Market was lowered from 50 to 20 mermaid's tears.

References[edit | edit source]

  1. Jagex. Mod Ash's Twitter account. 12 October 2018. (Archived from the original on 28 May 2020.) Mod Ash: "3 [lives] as standard. Add 1-3 for the tier of compost you used. The chance scales from 59% - 82% of NOT taking a life when you get an item, as your level goes from 1-99."
  2. 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."