134 PLANT PROPAGATION 
HumeEa.-—Some are very partial to the fragrance of 
the leaves of H. elegans, a biennial plant of graceful 
appearance when in flower. The seed should be sown 
in July in pots of finely-sifted soil, covered thinly with a 
sprinkling of silver sand, and placed in a cool, shady 
frame. When the seedlings are large enough, transfer 
to small pots, grow through the winter in a cool house 
where frost is just excluded, and plant out in June. 
Humutus (Hop).—The common Hop is increased by 
seed or by division in spring. The Japanese, both the 
green and variegated-leaved, are treated as annuals, 
being raised from seed sown indoors in April, or, where 
the plants are to grow outside, early in May. 
Hyacintuus.—For propagation of the Hyacinth, see 
BULBS, p. 19. 
HyDRANGEA.—These popular plants propagate readily 
by young or partially ripened shoots of about four joints 
inserted singly in small pots of sandy soil plunged in 
bottom heat in a close, moist frame. If desired, old 
plants that have several stems from the base may be 
divided in March. 
HypericuM.—Propagation is readily effected tbe seed 
sown in the greenhouse or outdoors in March. The 
shrubby species grow very well from cuttings of firm 
shoots 3 inches long under handlights in August or 
September. The tufted and creeping kinds are increased 
by division in autumn or-spring. 
Hyssop.—This aromatic herb, used in seasoning, 
may be raised from seed sown outdoors in April, by 
cuttings inserted in shady border in June, and generally 
by dividing old plants in spring or autumn. 
IMPATIENS (BALSAM).—A good time to sow Balsam 
seed is towards the end of April, in a temperature of 
