I have moss trouble on a bed with carpet spreaders – I just cannot keep the moss down. The spreaders are – Cotoneaster Queen Carpet. Potentilla, Genista Lemon spreader, Lonicera pileata I notice that you advise for lawns – ”To control moss, you need to apply sulphate of iron or lawn sand, between October and April and also apply lawn fertiliser in March and June.” I constantly find myself weeding the moss from between the branches – it is smothering the spreaders . Can I apply the same medicine to my carpet cover bed ? Thanks and appreciate the help.