Other vegetation types

[pahp]

Other types of non-seed-greating vegetation would make the environment and problem richer. Maybe low "weeds", "brush" and "trees" -- to plant "plants" the ground must be clear, which implies a "clear ground" action. Weeds take n turns to clear, brush m and trees o, where n < m < o and n is probably 1 or 2. Maybe brush takes two turns to navigate because it is tangly.