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You concern is real.
There's 2 ways around it...ONE, to build a small retaining wall creating a step... or TWO... give it a gentle slope and plant grass on it to retard any errosion from the water.
Your idea of a flower planter can be incorperated into the first idea and the 6 inch height is such that I wouldn't worry too much about it falling away.
Gerry
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