For start open your spellbook and click skill teleport and choose Cathebry (Farming)
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Then go talk to Wydin and buy seeds you need. (seeds in red square and vial of water in yellow for herblore)
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Now go run north until you reach farming patches
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And use your seeds you bought on tree patch.
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Levels for each seed(herbs you need coming soon):
9 Guam seed
14 Marrentill seed
19 Tarromin seed
26 Harralander seed
32 Ranarr seed
38 Toadflax seed
44 Irit seed
50 Avantoe seed
56 Kwuarm seed
62 Snapdragon seed
67 Cadantine seed
73 Lantadyme seed
79 Dwarf weed seed
85 Torstol seed
That's it for farming, now to herblore.
For that part you need clean herbs and vial of waters.
Clean your herb and use it on vial of water, here are levels you need for each potion:
1 - Attack potion
5 - Antiposion
12 - Strenght potion
22 - Restore potion
30 - Defence potion
38 - Prayer potion
45 - Super attack
48 - Super antipoison
55 - Super strength
63 - Super restore
66 - Super defence
72 - Ranging potion
78 - Zamorak brew
81 - Saradomin brew