just some clarifying information for this post , first off , only 1 cephalotus site is at a sea side site , that is Coal Mine beach site, all the rest are much further back inland and may be close at times to inland swamps/ soaks or land locked lakes ,with may be exception of a few but there still may be 1/2 a km from the actual sea shore .
all sites are comprised of fine sand based soils as the whole area so far back in time were massive sand dunes and gradually getting plant compost added over the millions of years from trees, shrubs and grasses composting , most sites with may be only Nothcliffe to a degree ,are fine dune sand compost based , the compost soils has a very high level of this fine sand in all soil in these area's in many areas as high as 60% , the sand is probably from the granite that is predominate in the coastal areas of Albany , though I have not investigated that part , but the sand is very fine grade and pure white indeed .
when taking PPM reading from water in winter at some sites the ppm reading was quite unexpectedly high ,the water dose not hang around as the sites are most on areas where the water runs past or drains quickly . on top and underneath the area ,making them the ideal site for cephs to grow . this is base on field site trips and observations only .