Dwarf weed seed: where to get it

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Source	Quantity	Chance per roll
Abyssal demon []	1	1/2,100
Ancient mage []	1	1/2,100
Ancient ranger []	1	1/2,100
Ancient warrior []	1	1/2,100
Animal Wrangler (Equilibrium League) []	1–3	1/33
Araxxi []	6	1/17
Araxxi []	10	1/17
Armoured phantom []	2	6/100
Arrg (Scratched) []	1	1/3,449.3
Automaton (Heart of Gielinor) []	1	1/2,066.7
Automaton champion []	1	1/2,016.7
Automaton Generator []	1	6/90
Automaton Guardian []	1	6/90
Automaton Tracer []	1	6/90
Banshee []	1	1/2,978.9
Berry []	1	1/3,449.3
Black Knight []	1	1/2,100
Black Knight champion []	1	1/2,066.7
Blood reaver []	1	1/2,066.7
Bloodveld []	1	1/2,100
Butcher demon []	1	1/2,016.7
Champion of Infernus []	1	1/2,066.7
Chaos dwarf []	1	1/2,100
Chaos dwogre []	1	1/3,788.8
Chaos Elemental (Members) []	1	1/3,640.9, 2.44 rolls
Chest (Cadarn district) []	1–2	268/2,101
City guard []	1	1/3,449.3
Cockroach soldier []	1	1/8,192
Columbarium key []	1	6/329
Commendation Rewards (Seed Pack) []	1	Unknown
Croesus (Active) []	3–4	60/1,000
Crux Eqal Knight (Pickpocketing) []	1	13/16,929
Crystal chest (Prifddinas) [{'content': 'With Possibility 5, you are guaranteed to get either a dwarf weed seed or torstol seeds.', 'name': 'herbseed'}]	1	1/68
Cyclops []	1	1/51,200
Cyclops (God Wars Dungeon) []	1	1/51,200
Cyclossus []	1	1/6,666.7
Dagannoth []	1	1/8,533.3
Dagannoth (Lighthouse) []	1	1/474.1
Dagannoth guardian []	1	1/16,384
Dagannoth guardian []	1	1/21,333.3
Dark beast []	1	1/711.1
Dark beast []	1	1/333.3, 3 rolls
Death Lotus rogue []	1	1/32,768
Desert strykewyrm []	1	1/841.7
Druid (Garden of Kharid) (Pickpocketing) []	1	26/21,696
Dust devil []	1	1/4,681.1
Earth warrior []	1	1/3,640.9
Earth warrior []	1	1/6,144, 3 rolls