Reasoning
Wess chose Herbalism + Alchemy for his Horde Skyborne Druid. It is self-feeding: herbs go straight into Alchemy. Alchemy's ACA list is heavy on caster and healer consumables (Lesser/Greater Mageblood, Cleric's Elixirs, Elixir of Sages/the Owl/Nature Power, Mender's and Spellblasting Potions and their Major versions), plus Flasks of Natural Accuracy/Aggression/Precision/Swiftness and thrown smog potions. Camp ladders: Incense Candle > Greenhouse > Seed Hybridizer (Intellect; grows and hybridizes herbs) and Mana Well > Fermenter > Alchemy Laboratory (mana regen; the Laboratory is required for advanced recipes). Healing Potions moved to First Aid; Alchemy keeps a 'Discolored' version. Bountiful Harvest (Legacy) adds up to +100% Scarce materials. Gathering herbs in Travel Form is reported but not confirmed. Also supplies potions and flasks to the Shaman.
Confidence note
Analysis built from sourced profession facts