Actually it is fermenting vegetables.

After arriving and a quick lunch at an awesome 6,500 KRW buffet (with fresh vegetables growing outside the restaurant), we were off to see the first property.

Vegetables and chickens have multiple cycles yearly, while harvesting timber may take a decade or two.

Also, in the letter that the company issued (indicating that no tank was found), they state that they cannot scan in areas with "excessive vegetation" and/or patios or decks. 

Spray it periodically with vegetation killer and cut back and remove any brush that encroaches on them.

Best brick cleaner for vegetation on the front of the house brick?

There is not much money to be made in inner-city vegetable gardening but it might be the only way to get something out of the lot. 

If you want to open a restaurant, are you going to buy vegetables from the people with a backyard garden or from the guy with the 1,000 acre farm?

One such fairly large community is based in Mexico and they follow agorism and some kind of bartering strategy (trade chickens/eggs for vegetables, bullets for food, etc.) 

However, if the house is truly vacant, would the HOA be able to enforce the appearance standards in order to keep the house looking nice, or would the typical distressed property signs start showing up, I.e. over grown vegetation, newspapers piling up, etc.?