Moss and weeds are a persistent headache in my garden, particularly in the gaps between my patio slabs and paving blocks. The combination of a wet winter and my constantly shaded paving creates the ideal breeding ground for moss and weeds to flourish and force their way through the joints. Fortunately, the moss hasn't yet spread to the point of blanketing the entire paving blocks and creating a slip hazard, but it certainly leaves my garden looking rather shabby. While salt and vinegar have