196 PRACTICAL PLANT PROPAGATION 



HAMAMELIS. Witch Hazel. 



SEEDS. Joseph Meehan gives the following notes: 



The shrub flowers in October and November, and the seed pods form 

 then, but do not ripen until the next August or September. The pods 

 are to be gathered then, when one or two by bursting open show the 

 time has come for it. These pods are placed on a tray and set in the sun, 

 that they may open at once. But they must have a sieve set over them, 

 as when the pods open they eject the seeds, sometimes to quite a dis- 

 tance. This is not known to all who attempt to secure the seeds, and 

 many are disappointed in finding themselves short of the seeds they 

 expected, Seeds sown in Spring, and covered lightly, usually grow very 

 well. Because of the shooting character of the seeds this shrub should 

 be called the Revolver Shrub. It takes five years to obtain salable 

 plants from seeds. 



GRAFTING. The Japanese species are grafted on the American, in- 

 doors. 



HEDERA. (See pp. 33, 69). 

 HIBISCUS. Rose of Sharon. Althaea. 

 SEEDS. Not true to color from seeds. 

 CUTTINGS. Hard wood in early Fall, stored until Spring. 

 LAYERS. Mound layering is often used. 

 GRAFTING. Graft named varieties on seedlings. 

 HICORIA. (See Carya.) 

 HIPPOPHAE. Sea Buckthorn. 



SEEDS. Sow as soon as ripe. Keep plants until they flower to de- 

 termine sex, for the plants are dioecious. 

 CUTTINGS. Hard wood does not root well. 

 LAYERS. Best method. Be sure to propagate both male and female 



plants. 



ROOT CUTTINGS. 

 HOVENIA. 



SEEDS. Grows readily from seeds. 

 CUTTINGS. Half-ripe wood in early Summer. 

 LAYERS. Late Spring. 

 HUCKLEBERRY. (See Vaccinium.) 

 HYDRANGEA. 



SEEDS. Many varieties seed freely. 



*GUTTINGS. Hard wood cuttings root readily in Spring. Green wood 

 cuttings in Summer under glass. The harder wooded sorts are best 

 propagated by green wood cuttings. Climbing sorts are difficult 

 to root. H. quercifolia use smallest wood for hardwood cuttings 

 in October. 



LAYERS. Cut down the bush the previous season to force the pro- 

 duction of many shoots. (See p. 98.) Successful with H. quercifolia. 

 GRAFTING. Use splice or cleft graft. May be made in Spring and 

 placed in coldframe. Roots collected during shipping season. 

 Pieces of roots are all that are necessary. Grafted stock is stronger 

 and healthier. 



HYPERICUM. St. John's Wort, 

 * SEEDS. Very fine; sow carefully. 

 *CUTTINGS. Green wood cuttings in September. 

 DIVISION OF PLANTS. Hardy species. 

 ROOT CUTTINGS. Spring. 



