re: cerastium tomentosum,snow in summer

Snow in summer is an invasive weed here. Zone 8 or 9 people beware. One
sickly looking plant of snow in summer has carpeted 20 square yards of a
60 degree bank within two years.  A tad dazzling en-masse in flower, but
not unattractive. Will effectively choke anything in its path. Don't let it
within yards of anything you like. Grows as a dense aubrieta type carpet,
but with far more vigour, and a tendency to self-seed somewhat as well.
(The self-seeding  doesn't become a problem provided one is ruthless about
ripping them out on sight.) Controllable only by weedkiller, lawnmower
strimmer or other vigorous type exercises.  
I like rubus tricolour or vinca for similar applications, which spread
equally rapidly but are more easily managed. Rubus will take as cuttings
very quickly and multiply up. Snow in summer looks great in a pot and works
well with bulbs which will come up through it.
Mark Speakman in Annaghdown, Ireland
markspkn@iol.ie
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