algae and moss in seedling pots

Peter Taggart
Thu, 02 Feb 2012 02:29:53 PST
I have never used it but I believe a little vinnegar will remove mosses and
algae from pots. I seem to remember that a  potassium permanganate solution
is the traditional cure. I think tar oils would also work (armillitox, or
winter tar wash for fruit trees), perhaps sulfer dust might do the job too?
. Mosses will grow to top of magnesium carbonate and calcium carbonate
rocks and walls, inches thick, in Derbyshire England, (alkaline rocks).
Mosses and algae will also grow well on the acid grit-stone, and in
enclosed or wet enviroments on 6 millimeter or larger gravel- including
As a foot note for those in drier climates - one of the jobs of a top
dressing is to prevent "puddling" (compacting of the surface) of the
growing medium by rain drops.

I concur with Mark that moss makes an excellent top dressing and growing
medium for some plants, for example Pleione or Trillium.

I usually repot or else replace the compost and top dressing from the bulbs
(plant roots in the case of non bulbs) upwards. This helps remove other
weeds too.
Peter (UK)

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