890 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



japonicum make dwarf groups. Helonias bullata, a beautiful pink- 

 spiked plant, wants the moistest place ; and all the purple Helle- 

 bores, or Lenten Roses, thrive. Iris aurea is beautiful in June or 

 July, and some of the Mertensias thrive well there. The Duck- 

 feet, or Podophyllums, are also at home. Senecio pidclwr takes 

 wonderfully to the moist upper beds, and some few other plants 

 which I have named in my list of bog-plants. I am inclined to 

 think that some such wet, peaty beds should surround all well- 

 constructed rock-gardens. There are so many of the Alpine 

 plants which love moisture at the root, with in some cases full 

 exposure to the sun, and in others enjoying shade. Some of the 

 Alpine Primulas would grow well in shaded bog. I have 

 Primula involucrata, nivalis, and Wulfiana all doing well in 

 such positions, as well as the Dryas and several Campanulas, 

 which soon dry up on the higher shelves of the rock-garden ; 

 and with the many North American and Himalayan plants, such 

 as Meconopsis, which are likely to enrich our Alpine gardens, 

 this is the secret of culture. Where water can be retained, all 

 bog-gardens should have their central or through-running pond, 

 and here the culture of water-plants can be judiciously and easily 

 joined with that of bog-plants. Such is Mr. Campbell's garden, 

 which I will attempt to describe somewhat to you. 



His water supply is the overflow from the house-roofs, 

 stored in two or three tanks of various kinds, to secure a con- 

 stant supply in case of need. It is on the sloping side of a hill, 

 and consists of a series of small basins, very artistically sur- 

 rounded with small rocky banks, on which many Alpine plants 

 succeed. Each part is devoted to one or two, or at most three, 

 kinds of Water Lilies in the deeper part, while the rather 

 shallower sides have some water-plants which do not require 

 any great depth of water. Thus the upper pool, three feet 

 deep, is devoted to yellow Nuphars of various sorts. In the 

 next is Nymplicea tuberosa odorata, with a red centre, and a very 

 fine form of the white Water Lily ; in the shallower water being 

 Arum virrjinicum, the flowering Rush (Butomus wnbellatus), and 

 the three forms of Bulrush (Typha latifolia, angitstifolia, and 

 minor). The third pool is full of Aponogeton, or the Cape 

 Pondweed, the yellow Iris and a locally found white variety, 

 the I. Kcempfcrii, I. fcetidissima, and I. pscudacorus, a 

 variegated form of Carcx riparia, and the Zebra Rush (Juncus 



