I have just planted a 6m high walnut (Juglans regia) coming from a nursery.
I would like to know some measures, to improve the soil (soil activity and water permeability) as the soil is very wet and not so much alive.
e.g. mulching, beneficial plants, etc.
Any suggestions for a ground cover that will stimulate them or at least not compete with them that can stand the juglone? One of mine is a seedling. The other is grafted on black walnut. I want to reduce mowing with useful plants as much as possible.
White clover should be OK under a walnut tree (but not crimson clover). From what I've studied so far juglone becomes a problem very gradually - see here: http://www.slideshare.net/Aliki85w/a-review-of-suitable-companion-crops-for-black-walnut - under the heading "Spatial and temporal buildup of juglone". By the time it starts having an effect the walnuts should already have grown nicely. This makes sense because juglone being a problem is an effect of walnut roots being well developed and wide.
Here's an older walnut-elaeagnus document from Canada: http://cfs.nrcan.gc.ca/pubwarehouse/pdfs/9087.pdf - among other things it is interesting because it shows that, in a 10-year period, 1) elaeagnus was again the best nurse plant and 2) whereas alder had dieback at the end of this period, elaeagnus did not.
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