I suggest you carry a heavy iron bar to test for the depth of the soil. Ivy is a fantastic wildlife plant as it provides shelter for nesting birds, autumn flowers for late-flying insects and berries for birds and small mammals in winter. Hedges For Clay Soil – So often you hear gardeners lamenting about wanting to grow x, y and z plants in their gardens only to qualify it with ‘but we are on clay’, as if it is some kind of soil borne deficiency or shortcoming. Flowers in May and June.