Big, big thumb up for Zigur.
And Morthoron not only is entirely correct on the linguistic point, but there is also the cultural issue as to whether any Dwarf would be versed in herb-lore. Dwarves on the whole were unconcerned with growing things, as befitted troglodytes, and never farmed if they could possibly buy foodstuffs via trade in manufactured goods or products of mining, or even manual labor of the sort thwey preferred, masonry and roadbuilding etc.