225gp
175gp
50gp
+46gp
—
—
Price history
1 points · hover for detail
- 30D low
- 175
- 30D high
- 225
- Volatility
- 25.0%
Flip calculator
Includes the 2% Grand Exchange tax
+46gp
+46 per item · +26.29% ROI
- Capital required
- 175 gp
- Gross revenue
- 225 gp
- GE tax (2%, 4/item)
- − 4 gp
- Break-even sell
- 178 gp
Item data
- High alchemy
- 12 gp94.7% below market
- Low alchemy
- 8 gp
- Shop value
- 20 gp
- Weight
- 0 kg
- Skill / type
- Farming
- Stack / note
- Stackable · not noteable
- Released
- Sep 7, 2017
About Seaweed spore
The Seaweed spore is a members-only item in Old School RuneScape.
"A seaweed spore - plant in a seaweed patch"
Over the last 30 days it traded between 152 and 302 gp on the Grand Exchange, averaging 246 gp. About 14,287 units changed hands per day. The price is down 6.6% across that window. The Grand Exchange buy limit is 600 every 4 hours. Selling one at the average price costs 4 gp in Grand Exchange tax.
Casting High Level Alchemy returns 12 gp, which is 95.1% below the 30-day average price, so alching a bought one loses money.
How to get Seaweed spore
9 monsters drop Seaweed spore, most commonly Lobstrosity (6/118), Hermit crab (4/128) and Long-tailed Wyvern (2/123). Only Mairin's Market sells it.
Dropped by
| Monster | Rarity | Quantity |
|---|---|---|
| Lobstrosity | 6/118 | 5 |
| Hermit crab | 4/128 | 1 |
| Long-tailed Wyvern | 2/123 | 12 |
| Spitting Wyvern | 2/123 | 12 |
| Taloned Wyvern | 2/123 | 12 |
| Ancient Wyvern | 2/132 | 16–24 |
| Ammonite Crab | 1/128 | 2 |
| Martin the Master Gardener | 1/1,892 | 1 |
| Master Farmer | 1/1,892 | 1 |
Sold in shops
| Shop | Price | Stock |
|---|---|---|
| Mairin's Market | 20 Mermaid's tear | 100 |
Seaweed spore price history
Daily averages rolled up per month, newest first.
| Month | Average | Low | High | Volume |
|---|---|---|---|---|
| October 202612d | 234 | 152 | 291 | 194,507 |
| September 2026 | 270 | 159 | 396 | 388,754 |
| August 2026 | 244 | 139 | 405 | 423,500 |
| July 2026 | 203 | 129 | 254 | 557,502 |
| June 202621d | 245 | 171 | 400 | 188,817 |
| May 20262d | 229 | 204 | 253 | 14,396 |
| April 20261d | 177 | 177 | 177 | 3,685 |
| March 2026 | 263 | 107 | 374 | 159,714 |
| February 2026 | 231 | 159 | 282 | 26,291 |
| January 2026 | 155 | 51 | 355 | 17,812 |
Across 10 months of recorded prices Seaweed spore ranged from 51 gp in January 2026 to 405 gp in August 2026, measured over 218 trading days.
The 30-day average of 246 gp sits around the middle of that range.
All prices in gp. Volume counts units traded across both sides of the Grand Exchange.
