WOODY PLANTS FOR NEW ENGLAND 31 



tuft of pale-green foliage surmounted by numerous small, showy flowers. It 

 can be used in sunny spots in rockeries, in walls, or in cracks of walks. Single 

 and double color forms are offered by the trade. 



Hemlock — See Tsuga 



Hibiscus syriacus ShRUB ALTHAEA 



Large, gray-wooded, upright shrub or small tree which has been much liked 

 because of its late flowering (July to September). It is a vigorous grower as 

 a young plant and hence not too hardy in inland locations. Older, slower- 

 growing plants are more winter-resistant and usually prove hardy from 

 Massachusetts south. It is rather stiff in habit to group well. Numerous 

 varieties of value according to personal taste are available, such as "Ardens", 

 double lavender-violet; "Banner", double white and crimson; "Bouie de Feu", 

 double violet-red; "Coeiestis". single blue; "Due de Brabant", double red; 

 "Jeanne d' Arc", double white; Lucy, semi-double pink; Rubis, single red; and 

 "Totus Albus", single white. 



Hippophae rhamnoides COMMON SEA-BuCKTHORN 



A gray-foliaged, large, deciduous shrub or small tree with gray shoots and 

 spiny branches. Its inconspicuous flowers are followed in September by 

 numerous small, bright orange, persistent berries on the more spreading female 

 plant. For such fruiting, presence of the more upright male plant is essential. 

 It is indifferent as to soil, and because of free suckering has been used to bind 

 sand dunes. Of little garden use except possibly as a hedge plant. 



Holly — See Ilex 

 Hollygrape — See Mahonia 

 Honey-Locust — See Gleditsia 

 Honeysuckle — See Lonicera 

 Hornbeam — See Carpinus 

 Horse-Brier — See Smilax 

 Horsechestnut — ■ See Aesculus 

 Huckleberry — See Gaylussacia 



Hudsonia montana 



A heath-like, evergreen subshrub from the mountains of North Carolina. 

 Though rare in cultivation because it is difficult to transplant, it is quite possible 

 in the rock garden. Here again is a plant which will serve as an example of 

 the futility of collecting well-established plants from the wild. 



HYDRANGEA ARBORESCENS var. GRANDIFLORA SNOWHILL HYDRANGEA 



A relatively small, slightly coarse-textured, upright-branched, deciduous 

 shrub which, in summer, terminates its shoots with rounded, white heads of 

 sterile flowers. As with all Hydrangeas, growth and flower size are increased 

 by cutting back in the spring. It will do remarkably well in poor, dry soil 

 and will withstand some shade, although with loss of flower quality. If let 

 go, it will spread rapidly and serve for a ground cover. However, for such 

 purposes the wild type H. arborescens would seem to be more suitable. 



HYDRANGEA MACROPHYLLA var. COERULEA 



This is an interesting variety allied to, and probably hardier than, the 

 colored, sterile-headed forms forced by the florists. While not of definite value 



