144 TOWN PLANTING 



able plant for the rock garden, and T. adian- 

 tifolium. Trollius asiaticus fl. pi. is another 

 plant of dwarf growth that cheers us annually 

 with its heads of double golden flowers, and 

 has survived for many years in a town garden. 

 All the Coltsfoots (Tussilago) do well, but 

 particularly T. alpina and the Winter Helio- 

 trope (T. fragrans). Valeriana montana, too, 

 has done well and increases in quantity, the 

 heads of bright pinky flowers being freely 

 produced. Several species of Verbascum do 

 uncommonly well in a town atmosphere, per- 

 haps the best being V. olytnpicum, with its 

 showy and irregularly produced yellow 

 flowers, and V. phoeniceum. The Periwinkles, 

 when established, thrive well in smoky local- 

 ities, particularly when planted beneath trees 

 on rockwork. Yuccas are capital plants for 

 the rock garden, where they succeed well, 

 even in the very midst of dust and smoke. 

 Plumbago Larpentce has few equals for with- 

 standing the deleterious effects of the most 

 impure of town atmospheres, and towards 

 Autumn is one of the brightest foliaged plants 



