Hi Slaoui! I'm not the most experienced person to give you information on tree guilds, but this link may give you ideas for one of the two zones you indicated:
https://permies.com/t/38578/Recommendations-companion-plantings-Fuyu-persimmon
Please note that the same zone number in different locations can vary widely, soils may be very different; so Ventura, California (zone 10) and the other zones mentioned by posters in the above
thread may have really different results from you when trying Fuyu Persimmons and the suggested guild companions.
What kind of trees do you want to base a guild on that already seem to grow well in your area? What soil type(s) will your guilds be growing in and what are the climate extremes (temperatures in summer & winter, winds, etc.) that your plants will need to survive and even thrive?
I don't know your
experience level, so excuse me if this is repeated information for you:
There are some basic concepts of what kinds of plants you'll want to surround your tree with: insectaries to attract beneficial insects/birds) / mulch plants (to "chop & drop" the leaves in place around the tree) / nitrogen fixers (clovers, beans, etc. to reduce the need for fertlizers) / nutrient accumulators (I believe there is some controversy as to whether dynamic nutrient accumulators like yarrow, dandelion, chicory, etc. actually let the plants around them benefit from the minerals the accumulator plants "bring up" from the subsoil; but I plant them in my guilds for increased plant diversity if nothing else.) / grass suppressing bulbs planted in a circle at the expected full-grown
drip line of your tree (spring bulbs that die back by early summer so they won't compete with your tree during the summer--active growing period.).
You're trying to get a mix of plants that "play well together" and each plant type adds a benefit for the overall health of the other plants in the mix.
These will give you some more information:
http://www.neverendingfood.org/b-what-is-permaculture/permaculture-guilds/
https://permies.com/t/1475/fruit-tree-guilds
https://permies.com/t/2978/guilds-plants
Here are some places for you to start researching plants you'll want to consider including in your various guilds:
Eric Toensmeier's list of plant databases:
http://www.perennialsolutions.org/perennial-plant-databases-organic-agriculture-gardens-permaculture-hardy-hybrids-varieties-information.html
Eric Toensmeier's Useful Plant Profiles:
http://www.perennialsolutions.org/useful-perennial-plant-profiles-hardy-organic-gardening-plants-permaculture-urban-resource-garden.html
Food Plants International (15,000+ plants):
http://foodplantsinternational.com/
Plants for a Future (UK location is temperate climate, but they include over 7,000 plants):
http://pfaf.org/user/Default.aspx
Research is great and helps stack the odds in your favor; but nothing beats the feeling of starting to actually grow a tree and experimenting with the guild to see what mix actually works together for you on your particular site.
Hope this helps...and good luck!
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