RE:Adam's request for a solution to putting urea on rocks without an
infraction of NYC laws and health codes in order to promote moss growth.
Many fertilizers have urea as the component of their nitrogen content. If
urea on a rock will promote moss growth, then I would presume that painting
the rock with some fertilizer would be a good place to start experimentally.
Different strengths of a particular fertilizer would probably have different
effects. You can buy active moss spores from a BONSAI store or supply
source and they even have some sticky material that can be obtained as a
gluey material that they put on rocks for tree roots(I forget the name of
it). To start moss in a new place, deeper shade would be preferable.
Bonsai people have a lot of experience with mosses. Try consulting with a
local group for further info. Also, a painted on coating or slurry of
clay(thin) would be another experimental technique that I would try. Lots
of area for study and experimentation here. pH, strength of solution, light
intensity, chemical composition of the substrate, microbial content etc. are
all parameters which need to be considered.
Elmer L. Morehouse - Biologist and Advanced Master Gardener
community_garden maillist - email@example.com