Perched Water Table

Chad Schroter
Wed, 04 Dec 2013 08:58:13 PST
SO if you want to maintain drainage and save weight you must use a material of the same particle size - but lighter.  Perhaps the Styrofoam beads used in "bean bag" chairs would work better than Ghost Farts.

-----Original Message-----
From: [] On Behalf Of J.E. Shields
Sent: Wednesday, December 04, 2013 8:45 AM
To: Pacific Bulb Society
Subject: Re: [pbs] Perched Water Table

The problem is capillary action holding water in the fine spaces in
the medium.  Until the hydrostatic pressure of the vertical column of
water exceeds the capillary attraction/surface tension of the water
at the bottom of the medium, the water won't flow down and out.

You will always get a better draining bed when the medium is uniform
from top to bottom.   In addition, the taller the water column, the
better the top of the bed will be drained.  It's physical chemistry
or physics at its finest.

Jim Shields

At 08:40 AM 12/4/2013, you wrote:
>Agreed that if the thought is that crocking results in better drainage -
>well, that's a crock of animal fertilizer.
>Bulb in 6 inch wide container, with 1/3 of 12 inch height filled with
>soda cans / packing chips (ghost farts, my brother calls them) /
>whatever should still drain satisfactorily, wouldn't it?.
>Judy in New Jersey ...

Jim Shields             USDA Zone 5
P.O. Box 92              WWW:
Westfield, Indiana 46074, USA
Lat. 40° 02.8' N, Long. 086° 06.6' W


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