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Beefing up NW windbreak on northern slope

Burton Rosenberger
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1.22 degree slope N NW (2.71 % grade)
Existing 25 - 30 conifers on a slight mound (maybe 1/2 a foot)
USDA Zone: 6b

Forum search results turned up one promising thread I am reviewing right now but it might not be what I am looking for.

1) How would I go about expanding the windbreak from the shrub layer out on a northern slope with already established trees? Or is it not possible? (There is shade on the north side of the trees all winter and the ground under the shade is frozen.

2 a) Would it be smarter to place a mound before the trees toward the north west since the trees area already established?
2 b) given there is only 20' to the property line on the NW corner of these existing conifers and 75' from the NE corner would a physical barrier be a better option?

3) How many hours of sunlight would be required for a shrub based conifer during winter? (In my case the sun would only be an evening sun and would likely only last a couple hours at best)

Right now my permaculture mind is leaning toward option 2.

This is going to be part of my second PDC design project and is turning out to be rather challenging given the gentle northern slope.

Thanks for any suggestions or experience you can share with me!
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