Once you've finished planting give the whole trough a good watering. This will settle the compost around the roots and eliminate air pockets 7 To finish off the planted trough top-dress with a layer of coarse grit. In addition to enhancing the plants, it will keep their tiny foliage clean. Hebe 'Emerald Green' is an extremely compact evergreen shrub. Sedum spathulifolium 'Cape Blanco' produces mats of foliage and yellow flowers in summer.
Most varieties produce their flower rosettes in spring.