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Garden Stone Wall

I need advice on
building a low garden wall of 3 or 4 dry stacked layers similar to the one in
pic #1 below. The blocks have irregular surfaces like in pic #2 below, 3"
thick, 5" wide, 9" on the long side and 6" on the short side.

In addition to
plants trailing over the wall as in pic #1, I would like to grow alpine plants
in wall pockets that I need to create as I build the wall. In other words, I
need to space the blocks apart and slant the wall backwards to create the wall
pockets to fill with soil. So here are the questions.

How far can I space
the blocks apart? 1"? 2"? 3"?

How much can I slant
the wall backwards (batter)? 1" per layer? 2" per layer? 3" per layer?

Can I backfill with
compacted soil? Or do I need to backfill with gravel?

Since the wall will
only be 9" or 12" tall, I will not dig and put in a base. For one,
the soil is moderately compacted. But more importantly, I like the wall to look
old, and I will certainly space the blocks apart in irregular ways with slightly irregular batter, shim some blocks slightly out of angle, place some other
blocks slightly out of alignment, etc. Some frost heave and sink will only improve the aged look of the slightly irregular and slightly randomly built wall. The wall will only be 20-22' long, so the design can be easily 'manicured' as the wall is being built.

My objective is to
create as much planting space in this 'old' wall as possible without
jeopardizing long term stability of the wall. I don't mind annual or semi-annual maintenance of the wall.

Any guidance on how to best build
the wall appreciated, thanks!

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