if you are removing the cedars, remember that they make wonderful
fence posts and other lumber so use them in that way if you have the ability to..maybe even trellises..
I'm not sure about the alleopathy but in
gaia's garden there is information on barrier plants..putting a plant between the cedar(or in the
gaia's garden case juglone) and the other plants you are putting in..the barriers will help protect the other plants from the alleopathy..
you might look up cedar alleopathy..i did that with walnuts, as we have lots of baby walnut trees I put in..and I'm always putting in more, i love my walnuts.
the info I found most helpful was from the
local universities..so when you are googling look for university sites.
i've never really had any problem with the few cedars (eastern red) growing on our propery, but they are in evergreen hedgerows for protection and privacy at the road line..so..they aren't planted near my food forest plants anyway.
things seem to grow quite well on the sunny side of them, but of course they cast so much shade not much would grow in their shade..anyway.