Troughs or tufa, only?

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Lori S.
Title: Moderator
Joined: 2009-10-27

I think the difference, if any, would not be measurable or observable, given the limited contact, if any, of soil inside the trough with soil outside the trough via the trough's drainage holes... so long as the trough was not sitting in a place where water could actually collect and be wicked into the trough (although even that would be very limited).
If the trough was set up on blocks, as often is the case, the nature of the underlying surface should have no influence at all.  I could believe that setting a trough up on blocks may possibly affect the ability of the plants within to winter-over in very cold climates though.

Calgary, Alberta, Canada - Zone 3
-30 C to +30 C (rarely!); elevation ~1130m; annual precipitation ~40 cm


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