Ask any seasoned rose grower for their secret and, sooner or later, they'll point at the ground. The flowers get the admiration, but the soil does the real work: it holds the water, feeds the roots and decides whether your rose sails through a dry July or sulks in a soggy September.  The good news is that roses are wonderfully adaptable. They'll grow happily in almost any garden, from heavy clay to light sand, as long as you understand what your soil is doing and give it a helping hand.