DRY-WALLED TERRACE GARDEN 7 



plants that are hardy in England and like warm 

 places in our gardens, can be used. Many of these 

 have greyish foliage, and it would be greatly to the 

 advantage of the planting, from the pictorial point 

 of view, to keep them rather near together. It should 

 also be noted that a large proportion of them, of 

 shrubby and half-shrubby character, are good winter 

 plants, such as Lavender, Rosemary, Phlomis, Othon- 

 nopsis, and Santolina; the last, as may be seen in the 

 illustration at p. 22, being specially well clothed in the 

 winter months. They can be as well planted at the 

 top edge of the wall, at the bottom, or in the face. 

 With these plants well grouped, and the addition of 

 some common white Pinks, and the useful hybrids 

 of Rock Pinks ; with a few grey-leaved Alpines such 

 as Cerastium, Artemisia nana, A. sericea, the encrusted 

 Saxifrages, and Achillea umbellata, a piece of the best 

 possible wall-gardening can be done that will be as 

 complete and well furnished in winter (but for the 

 bloom of the plants) as it is in summer. Achillea 

 umbellata is a plant of extreme value in wall-planting 

 in all aspects It grows fairly fast, and from a few 

 pieces of a pulled-apart plant will in a short time 

 give the result shown in the illustrations ; it should 

 be replanted every three years. There is no need in 

 such a case to remember the exact date of planting. 

 The plant is at its best in its first and second year ; 

 then it begins to look a little straggly and over-worn. 

 This may be taken as the signal for replanting, as in 

 all such cases with any other plants. 



Such a choice of plants would serve for quite 



