What is a Forest Garden?

Wikipedia:

"Forest gardening is a food production and land management system based on woodland ecosystems, but substituting trees (such as fruit or nut trees), bushes, shrubs, herbs and vegetables which have yields directly useful to humans. Making use of companion planting, these can be intermixed to grow on multiple levels in the same area, as do the plants in a forest."

http://en.wikipedia.org/wiki/Forest_gardening

On Martin Crawford's website it says:

"A forest garden is a designed agronomic system based on trees, shrubs and perennial plants. These are mixed in such a way as to mimic the structure of a natural forest - the most stable and sustainable type of ecosystem in this climate."

http://www.agroforestry.co.uk/forgndg.html

On the back of his book it says:

"Forest gardening is a novel way of growing edible crops - with nature doing most of the work for you. A forest garden is modelled on young natural woodland, with a wide range of crops grown in different vertical layers. Unlike in a conventional garden, there is little need for digging, weeding or pest control. Species are chosen for their beneficial effects on each other, creating a healthy system that maintains its own fertility."

On p17 of his book under the title What is a forest garden? it says:

"A forest garden is a garden modelled on the structure of young natural woodland, utilising plants of direct and indirect benefit to people - often edible plants. In may contain large trees, shrubs, herbaceous perennials, herbs, annuals, root crops and climbers, all planted in such a way as to maximise positive interactions and minimise negative interactions, with fertility maintained largely or wholly by the plants themselves."

In the Edible Forest Gardens book under a heading What is an Edible Forest Garden? it says:

"An edible forest garden is a perennial polyculture of multipurpose plants. Most plants regrow each year without replanting: perennial. Many species grow together: polyculture. Each plant contributes to the success of the whole by fulfilling many functions: multipurpose. In other words, a forest garden is an edible ecosystem, a consciously designed community of mutually beneficial plants and animals intended for human food production. Edible forest gardens provide more than just a variety of foods. The seven Fs apply here: food, fuel, fibre, fodder, fertilizer, and "farmaceuticals", as well as fun. A beautiful, lush environment can be a conscious focus of your garden design, or a side benefit to enjoy. Forest Gardens mimic forest ecosystems, those natural perennial polycultures once found throughout the world's humid climates"

http://files.uniteddiversity.com/Permaculture/Agroforestry/Forest_Gardens/Edible_Forest_Gardens_Vol.1-Vision_and_Theory.pdf

On the back of Patrick Whitefields' "How to Make a Forest Garden" it says:

"A forest garden is a food-producing garden, based on the model of a natural woodland or forest. It is made up of fruit and nut trees, fruit bushes, perennial vegetables and herbs. It can be tailored to fit any space, from a tiny urban back yard to a large rural garden".+

Inside the book it says:

"A forest garden is a garden modelled on a natural woodland. Like a natural woodland it has three layers of vegetation: trees, shrubs and herbaceous plants. In an edible forest garden the tree layer contains fruit and nut trees, the shrub layer soft fruit and nut bushes, and the ground layer perennial vegetables and herbs. The soil is not dug, and annual vegetables are not normally included unless they can reproduce by self-seeding. It is usually a very diverse garden, containing a wide variety of edible plants."