Jim:
The mesh is not critical. The only requirements a that it not
corrode too fast, and that it not block too much of the drain hole.
Generally it is about 1/8-inch mesh.

Several things that are satisfactory -- "plastic" window screen,
plastic structure used for "counted cross stitch", "hardware cloth"
metal screening (not aluminum).

Small pebbles will work fine, but generally use up too much space,
particularly in shallow pots.

Hope this helps,

- Tom in West Virginia, Zone 6,
where tiny oaks from mighty acorns grow
-- -- -- -- --

Buridan wrote:

I am about to repot some bonsai, but have not been able
to find any of the mesh which is apparently required for
the base of the container ( to prevent loss of soil on watering)/
Is there any readily-available substitute which could be used
eg pebbles etc?

Jim

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