Local, community-grown food also requires no imported, long-distance transport which further depletes our fossil fuel reserves.[56] In developing more efficiency per land acre, urban gardens can be started in a wide variety of areas: in vacant lots, public parks, private yards, church and school yards, on roof tops (roof-top gardens), and many other places. Communities can work together in changing zoning limitations in order for public and private gardens to be permissible.[57] Aesthetically pleasing edible landscaping plants can also be incorporated into city landscaping such as blueberry bushes, grapevines trained on an arbor, pecan trees, etc.[4] With as small a scale as home or community farming, sustainable and organic farming methods can easily be utilized. Such sustainable, organic farming techniques include: composting, biological pest control, crop rotation, mulching, drip irrigation, nutrient cycling and permaculture.[58] For more information on sustainable farming systems, see sustainable agriculture.