Re: [gardeners] Bathtub gardens

Liz Albrook (
Wed, 26 Aug 1998 08:01:23 +0000 <> wrote:

> Im not sure if you are planning on putting the gravel and sand in
> and then some soil? So I just want to mention that water does not go
> from one soil type to another when its stratified until the top
> layer of soil is VERY saturated. So what ever you use I would
> suggest not layering it.

The drainage of the top layer is very much dependent on the nature of 
that layer -- much more than on the nature of the layers under it 
unless those layers have poor drainage properties.  Gravel and sand 
are ideal underlayments for a fast draining mix.