This is functional polyculture that turned grassy field into productive guild in zone 6 of cool temperate climate of Central Europe.
low canopy - peach
shrub layer - thornless blackberry, japanese vineberry
herbaceous, groundcover - mint, strawberries
It is beautiful, fruitfull and much apreciated by bees and other beneficial insects.
I simply made three small mulched circles (1m diameter) in a given area and in one sowed a peach seed, in another one planted mint cuttings, strawberries and the third one a rooted cutting of thornless blackberry.
Mint and strawberries spread and took over the grass with a little help of course woody mulch over grass, peach tree grew fast from seed (4 years old in this picture) and blackberry is also happy with regular mulching in its base and then it roots on the tips that touch the ground.
Peach tree need sun so i let it have it, but you can support balckberry on a pole on south side of peach tree or a bit further away where it bears heavily. Spreading blackberry plants do not fruit so much, but still do if you cut it appropriately.
If i would start again i would start bending young peach branches, thus creating smaller tree, faster and more abundant fruiting.
One of my favourite guilds which is far from done as there is one young fig tree that will replace peach tree in years to come.
If you would like more information on the guild, feel free to ask.
Designed and implemented by Aljaž Plankl