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Thanks for the reply's. For the smaller driveway island, the idea was to plant grass ontop, with a couple of tree's in the center... But knowing the wife, she may in the future, want to place flowers along the top of the boulders..
As for the larger boulder wall, there will just be grass upto the boulders, the other parts of the yard will have more scrubs and bushs.. I think for the larger wall I will be using the drainage like you all suggested, with an envelope of crushed stone in Geotex fabric and drainpipe, this would definitely help.
Thanks,
Curt
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