By Elaineharris
United Kingdom 
what is the optimum PH for growing roses and is it a good idea to lime if the soil is too acid
12 Nov, 2011
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I do not think that Roses are that fussy over pH but prefer slightly acid soil. I would not use lime unless your soil is very acidic, like 5 or below.
What would benefit them best is a thick, light compost like John Innes 3 with some bone meal. Then mulch over winter.
15 Nov, 2011