On 14 Aug, 12:43, "john hamilton" wrote:
I've tried slashing it with a knife, but it just grows in more vigorously..

http://tinypic.com/r/14cv7tk/4

Would prefer a simple non chemical solution, but if its not likely what
chemicals to use please? * *Thanks for advice.

Dunno what it is. What you need is a selective weedkiller. "Pastor"
kills everything except grass. It's intended for use on pastureland.
You will have to get it from an agricultural supplier.
Unfortunatelythy only sell giant bottles. Lifetime supply unless you
can share with someone.