For dry, sunny, and stony banks Rock Roses may be chosen, but the position must be wind-screened, a more important factor in the question of their hardiness than cold. The large-growing Gum Cistus is well known and tolerably hardy everywhere, and so also is _C. laurifolius_, but there are several most desirable species of dwarfer growth, such as the white, crimson-spotted _C. lusitanicus_, the pink-flowered _C. villosus_, the bright-red _C. crispus_, and the pure white _C. florentinus_, which are quite happy in sheltered rock walks especially by the sea; they have been also grown with success in many colder situations inland. The Cistineæ, at best, are somewhat short-lived, and lose vigour and power of resistance as they grow older. Keep up, therefore, young, thrifty stock by yearly cuttings to fill up inevitable gaps, which is a matter of no cultural difficulty. Where Rock Roses are out of the question, their place may worthily be filled by the hardier shrubby _Helianthemums_, though they differ greatly from Cistineæ in their trailing habit and smaller flowers. The breadths of brilliant colour given by these Sun Roses while in bloom are invaluable, and may be enjoyed to the full in almost any locality, while the many variations of tint, from deep green to ashen grey, in their leafage should also be taken into consideration, as it increases their usefulness when out of flower.
No list of good shrubs for the Rock Garden would be complete without some reference to _Yuccas_, which for all practical purposes must be included under that head. Groups of these magnificent plants, with their sub-tropical effect, cannot be surpassed for nobility of outline and stateliness of flower. To do them full justice, they must have space to develop their grand proportions, but this may often be found on the ridge or upper slope, even in rock-work of limited character. _Y. gloriosa_, with its fine form, _Y. recurva_, and the stemless _Y. flaccida_, of smaller growth, are amongst the best and hardiest kinds, and to these may be added _Y. angustifolia_, another valuable and nearly stemless species.
It is only possible, in restricted space, to touch in a very cursory way upon a few of the available groups of dwarf-growing shrubs. Many more than have been mentioned will occur readily to the minds of those who are at all conversant with plants, such as _Abelia rupestris_, _Magnolia stellata_, several beautiful species of _Daphne_, some of the St. John's Worts, of low-growing _Cytisus_, and others which may be classed under the head of miscellaneous. The subjoined list, though it does not pretend to be exhaustive, will be found of use, either for purposes of winter greenery or for summer embellishment, by those who are seeking good and suitable dwarf shrubs for planting, under varied conditions in the Rock Garden.