A damp and
dark day in Shropshire and though the threatened worst excesses of the
unfortunately named, ‘Storm Brian’, have yet to strike us, it’s still raining
heavily enough to prevent me working outside.
I had been
working in my pond, pulling out the Australian Swamp Stonecrop ( Crassula helmsii) which came from who knows where to set up home with us a
couple of years ago, and liked the situation so much it now needs two sessions
a year of me pulling it out to keep it under control.
The only
weed the pond is supposed to be home to is Curly Waterweed (Lagarosiphon major), which we put in as an oxygenator when we first made the
pond twenty or so years ago and which, being less thuggish by nature than its
neighbour, continues to float about on the surface of the water in clumps about
the same size as those we introduced.
Australian
Swamp Stonecrop was introduced to Britain from Tasmania in 1911, was first sold
as an oxygenating plant in 1927, by Perry’s Hardy Plant Farm in Enfield, and
was first recorded as growing in the wild in a pond at Greenstead Farm in Essex
in 1956.
The plant
first appeared in our pond as a small light green tussock which had attached
itself to the surface of a pot with a plant in it growing just above the
waterline and then grew out rapidly to form a dense mass of vegetation. Bits of
that vegetation then broke away from the parent plant when I tried to remove it
and rooted into other plants in the pond. That is how it has continued to
spread around the pond.
Australian
Swamp Stonecrop eliminates native flora by out-competing with it. It is shade
tolerant, frost tolerant, desiccation tolerant and has no dormant season. The
only ways of controlling it at all seem to be to cover small patches of it with
black plastic or carpet, or spraying it with formulations of Glyphosate
specific to aquatic environments.
In the garden, on a bank above the pond,
perhaps, look out for the deep rose pink flowers, spreading habit and vigorous
growth of Erica carnea ‘December
Red’, the Winter Heath, adding brightness to our lives in the depths of
winter
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