I'm looking for some input, suggestions, additions.
I'm designing a polyculture mix of companion plants to enhance and restore soils while still providing a food source to eat or sell.
This is with my dense clay and zone 5/6 in mind.
It began by thinking up what to cover my new hugelkultur bed with. Now I've split it into two mixes
1. For the relatively shallow soil of a new hugelkultur -bush beans/black eyed peas (nitrogen)
-herbs: tarragon, sage, thyme, savory, borage (pest control and selling)
-strawberry (for eating and selling)
2. For general terrain, no wood -bush beans
-herbs: as above
I'm not sure about how the comfrey and alfalfa will play with the others. Antagonistic? Positive?
I think the comfrey will play nicely, but one thing you need to keep in mind about comfrey that once you put down, it is hard to remove. It does spread slowly. Comfrey is wonderful as a chop n' drop mulch, and it has a large taproot that can break up the soil and mine minerals. There is a good post about this in the Should I Be Afraid of Comfrey? thread, and further information about comfrey can be found at the value of comfrey thread.
Since you have clayey soil. I think rootcrops will be of value in your ployculture. They will help to loosen and aerate the soil. Then, if you decide not to harvest the rootcrops and let the plants decompose in the soil, they will help you cultivate the soil life. Here are some rootcrops to considr:
-sunchokes (treat this as a permanent structure if planted, highly productive, hard to get rid of)
As ever, so much depends. Comfrey will become a fairly large plant with broad leavs, meaning it is going to shade out and push aside others that are too close. Alfalfa can produce massive quantities of roots, reaching deep, but can also be hard on neighbors. Something about alleopathy with. alfalfa too, I seem to recall.
Any particular reason you don't have dill on your herb list? It is on mine
Bush beans in with comfrey and alfalfa - I don't see the beans fairng well with that competition. Both of the others will grow taller and shade out the beans.
I might recommend looking into cover crop mixes, where some of the research is suggesting mixes of ten or more varieties.
It also matters what scale you are planning for. Is this for acreage, or for garden beds? Different choices make sense on different scales.
I often want to be able to compare all the different companion planting charts easily, so I thought I'd paste all the ones I was finding here, so other people would have them in one easy-to-find place.
Wow! Thank you Nicole A for all those awesome charts. (I particularly like the variety of styles - some look very good for the more "visual thinkers" among us.)
I've read a number of positive things about using daikon radish for busting up clay soils (also called lo bok I think? it's Oriental). I even read that some New Zealander's created a particular strain for soil busting, but I've no idea where I read that.
I've had mixed results with borage. The first location I put it, it's been marginal and fairly unhappy. The second and third spots, planted last year, took time to establish but then took off extremely well. I could/should have chopped and dropped it for the sake of the soil, but it was the only thing in that area that was blooming and the bees were stocking up for winter, so I decided that as important as the soil is, the bees deserved the treat even more. In other words, "if a plant fails to live up to its promise, try it somewhere else", coupled with, "the law of unintended consequences should be observed."
Mathew McCoul - it would be wonderful if you could post an update with info about both what worked and didn't work?