March.~\ GREEN-HOUSE REPOTTING. 243 



splendour of their beauty ; but if allowed to decay on the 

 plant, they will soon become musty, and all their colour 

 fade. (Soil No. 6.) 



Hibbertias, about ten species. Three of them are known 

 to be fine climbing evergreen shrubs, namely, H. glossu- 

 larisefolia; H. dentata; H. volubilis, if closely approached, 

 has a disagreeable smell ; H. fasciculata, II. saligna, and 

 ff. pedunculata, are evergreen shrubs ; they have pure 

 yellow flowers of five petals, blooming from May to Sep- 

 tember. (Soil No. 12.) 



Hoveas, about eight species, pretty plants of New South 

 Wales, blue pea-flowering evergreen shrubs ; the finest are 

 H. panosa, H. atropurpurea, H. linearis, H. rosmarinifo- 

 lia, H. longifolia, and H. Celsii, which is the most superb, 

 and flowers in abundance. They grow and flower freely ; 

 the pots should be drained. (Soil No. 6.) 



Hypericums. St. John's wort, about twenty species. A 

 few of them are very showy, and, with few exceptions, 

 have yellow flowers. H. monogynum, H. balearicum, H. 

 floribundum, H. canariense, H. aegyptiacum, and H. cochin- 

 chinense, which has scarlet flowers, are among the best, 

 and all of them flower freely ; five petals, filaments many in 

 three or five parcels. They are all of very easy cultiva- 

 tion, and bloom generally from April to September. (Soil 

 No. 11.) 



Hydrangea hortensis is a well-known plant, and much 

 esteemed for its great profusion of very elegant, though 

 monstrous, flowers. They are naturally of a pink colour, 

 but under certain circumstances of culture they become 

 blue. If grown in brown loam with a little sand, they will 

 preserve their original colour; but if grown in swamp earth 

 with a little mould of decayed leaves, they will become 

 blue.* The swamp earth and vegetable mould being more 

 combined with aluminous salt than brown loam, is the 

 cause of the change : and, when first found out, (which was 

 merely by chance,) was thought a great wonder. It must 

 have a very plentiful supply of water when in flower, 

 which is produced on the shoots of the previous year. 



* Mix the iron sparks, from the blacksmith's shop, with any 

 kind of soil, and they will be a beautiful blue. One and a half 

 quarts to a bushel will do. 



