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They'll be fine after you plant them. I assume that you're in the north (US or Europe), so it's very important that you water the arbs very, very well this autumn - up until the ground freezes. This will help prevent them from experiencing any/much winter-kill. I would also water them well the next summer (at least one inch/2-3cm per week). After a season in ...


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You can grow grass on a thin substrate but without soil depth the roots will be shallow and the grass will die in drought or severe condition unless you constantly upkeep it with extra watering, extra fertilizer, more mowing. Unlike most woody plants, grass doesn't have a taproot, so it has a fibrous wide root.


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