TREE AND SHRUB LIST 191 



CLETHRA. White Alder. Pepperidge. 



*SEEDS. Sow in pans in sandy or peaty soil. 



CUTTINGS. Green wood taken from forced plants in Spring. Use 



bottom heat. 

 DIVISION. Of clumps. 

 LAYERS. 



COLUTEA. Bladder Senna. 



*SEEDS. Seeds freely and grows readily in Fall, Winter or Spring. 



CUTTINGS. Hard wood. 



GRAFTED. Varieties grafted on C, arborescens. 



COMPTONIA. Sweet Fern. 

 CUTTINGS. 

 DIVISION. 



CORNUS. Dogwood. 



SEEDS. Do not germinate until second year. C. florida stolonifera, 



C. sericea, C. sibirica, C. alternifolia and C. paniculata are propa- 

 gated by seed. 

 CUTTINGS. All species with willowy, soft growth, such as C. alba, 



C. sericea and C. stolonifera are propagated by hard wood cuttings. 



Soft wood in Summer also. 

 BUDDING AND GRAFTING. C. florida var. rubra and C. f. pendula are 



grafted in Spring or budded in July on the type. C. alba sibirica 



is sometimes grafted on piece roots in Winter. 

 LAYERS. Continuous layers may be made of many of the shrubby 



sorts. 

 CORYLOPSIS. 



SEEDS. Sow in Spring. 



CUTTINGS. Half-ripe wood in Summer under glass. 



GRAFTING. Perhaps can be grafted on Witch Hazel in Winter in 



greenhouse. 



Few shoots are normally produced, so that cuttings and layers are 



slow. 



CORYLUS. Hazelnut. Filbert. 



*SEEDS. Sown in Autumn or stratified until Spring. Seed grown 



stock gives superior root system. 

 LAYERS. Purple-leaved sorts are propagated by this method. The 



old plants cut down and young shoots growing from this operation 



are layered. 

 GRAFTING AND BUDDING. On the type, seldom done. 



COTONEASTER. 



SEEDS. Sow in Autumn or stratify. 



CUTTINGS. Evergreen sorts best propagated by cuttings. 

 GRAFTING. Deciduous sorts are grafted on Quince, Hawthorn or 

 Mountain Ash stock. 



CRATjGUS. Hawthorn. Thorn Apple 



SEEDS. Seeds gathered in Winter and stratified germinate in two 



years. 



CUTTINGS. Cuttings of most by either hard or soft wood. 

 BUDDING. The doubles, especially, are budded on almost any 



American species such as C. coccinea or C. cras-galli. Bud in July. 



Hawthorns mature early in season. 



