100 m2 of herbs can produce $1k monthly
we need to win herbal layer around key areas
enemies: fragrant, ageratina, almost all grass
instead we can produce around 40 herbs
1 worker spending 2 hours can control and efficiently yield from 100 m2 every month
that means that 1 worker can control around 20 ares
this translate into ~1 ha of yielding surface
other buildings: 10 meters around