i8o PLANT CULTURE 



very dry soils, the roots penetrating to a great depth. They are of 

 easiest culture and deserve great popularity. Old plants need to be 

 frequently renewed, as they seem to exhaust themselves, probably 

 owing to their rampant growth. 



Propagation. They are chiefly propagated by seeds, but they 

 may be also propagated by cuttings. 



CALLUNA (Heather). C. vulgaris is seemingly as much at 

 home in a hothouse at Washington as in the highlands of Scotland. 

 It might be planted more commonly in shrubberies and thus relieve 

 the monotony of some borders, by helping to give them a little 

 more variety. In making a place for this plant, take some broken 

 bricks and a bushel of peat, mix together and plant the Heath in it. 

 They do very well for naturalizing. Cut branches keep their life- 

 like appearance for months. After flowering the plants should be 

 cut down to keep them bushy at the base and well-shaped. They 

 prefer a sunny location. 



Propagation. Cuttings are made from December to April, 

 preferably from young plants, the tender shoots i inch in length 

 being best. 



CAMPANULA (Harebell. Bellflower). There is an amazing 

 wealth of material in this genus. There are species that grow only 

 2 inches in height and others that are 3 feet tall. The biennials, C. 

 Medium and C. Medium calycanthema, are the most commonly 

 planted, the latter having the well-known cup-and-saucer arrange- 

 ment. These and the C. persicifolia and its varieties, which are usu- 

 ally treated as biennials, have their seeds sown in late Summer and 

 are wintered in a frame. C. pyramidalis and C. persicifolia are used 

 as florists' flowers, the latter being the more useful. Of the C. per- 

 sicifolia the variety Moerheimei is the best white. Daisy Hill is also 

 an excellent white of this species. C. p. alba grandiflora and C. p. 

 alba coronata are good whites, the latter being of the cup-and-saucer 

 type. C. p. albaflore plena, a double white, while it lasts, is one of 

 the best Summer flowers. There are also single and double blue 

 forms, all growing about 2 J/2 feet high. Plants which remain in the 

 ground over Winter will be benefited by a mulch of leaf soil and 

 short manure around the crowns. Of C. TrachcUum there are double 

 blue and white forms; height 2}-^ feet. C. Van Hoiittci, a hybrid 

 form with dark blue flowers, grows about 2 feet tall. C. grandis 

 and C. g. alba are both good; height 3 feet. C. pyramidalis is the 

 tallest species; height s feet. 



