Torstol seed: where to get it

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Source	Quantity	Chance per roll
Abyssal demon []	1	1/3,150
Ancient mage []	1	1/3,150
Ancient ranger []	1	1/3,150
Ancient warrior []	1	1/3,150
Animal Wrangler (Equilibrium League) []	1–3	1/33
Armoured phantom []	1	6/100
Arrg (Scratched) []	1	1/6,898.5
Automaton (Heart of Gielinor) []	1	1/3,100
Automaton champion []	1	1/3,025
Banshee []	1	1/5,957.8
Berry []	1	1/6,898.5
Black Knight []	1	1/3,150
Black Knight champion []	1	1/3,100
Blood reaver []	1	1/3,100
Bloodveld []	1	1/3,150
Butcher demon []	1	1/3,025
Champion of Infernus []	1	1/3,100
Chaos dwarf []	1	1/3,150
Chaos dwogre []	1	1/7,577.6
Chaos Elemental (Members) []	1	1/7,281.8, 2.44 rolls
Chest (Cadarn district) []	1–2	131/2,101
City guard []	1	1/6,898.5
Cockroach soldier []	1	1/16,384
Columbarium key []	1	6/329
Crux Eqal Knight (Pickpocketing) []	1	23/16,929
Crystal chest (Prifddinas) [{'content': 'With Possibility 5, you are guaranteed to get either a dwarf weed seed or torstol seeds.', 'name': 'herbseed'}]	2	1/17
Crystal impling []	2	40/500
Crystal impling jar []	2	40/500
Cyclops []	1	1/102,400
Cyclops (God Wars Dungeon) []	1	1/102,400
Cyclossus []	1	1/10,000
Dagannoth []	1	1/12,800
Dagannoth (Lighthouse) []	1	1/711.1
Dagannoth guardian []	1	1/32,768
Dagannoth guardian []	1	1/32,000
Dark beast []	1	1/1,066.7
Dark beast []	1	1/500, 3 rolls
Death Lotus rogue []	1	1/65,536
Desert strykewyrm []	1	1/1,262.5
Druid (Garden of Kharid) (Pickpocketing) []	1	21/21,696
Dust devil []	1	1/9,362.3
Earth warrior []	1	1/7,281.8
Earth warrior []	1	1/12,288, 3 rolls
Eastern soldier []	1	1/131,072
Elf warrior (Elf Camp) []	1	1/752.9
Enclave guard []	1	1/6,898.5
Transmutation (Equilibrium League) [{'content': 'Requires appropriate material to transmute from.'}]	1–10	Special
Exiled kalphite guardian []	1	1/3,200