ROCKERY PLANTS 



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its white variety, are sold by almost 

 every seedsman, and can be raised 

 in quantity at a very low cost. 

 Others, such as garganica, pulla, 

 and Raineri, all of which are of 

 some shade of blue, can be propa- 

 gated by seeds or division in spring. 

 They are free-flowering plants of 

 charming habit, and look well among 

 stones. 



Convolvulus. The species mauritanicus, 

 blue with white centre, is a pretty 

 plant, and can be raised from seed 

 ** in spring or early summer. 



Coronilla varia. This charming rosy trailer 

 is worth including in a fairly large 

 rockery, although not of the first 

 importance. 



Cyclamen. The species europaeum, men- 

 tioned in the spring section, may 

 bloom in summer. 



Cypripediums (Ladies' Slippers). These 

 lovely Orchids are well adapted for 

 cool, moist, shady positions at the 

 base of rockeries, but they will not 

 thrive in hot, dry spots. There are 

 two well-known species, namely, cal- 

 ceolus, red and yellow; and specta- 

 bile, rose and white. The latter is 

 a truly beautiful plant. Both thrive 

 in moist peat. Propagated by divi- 

 sion. 



(i) Dianthuses. The Alpine Pinks are not 

 limited to spring-flowering species, for- 

 tunately. Several of the most beau- 

 tiful of them are summer bloomers, 

 and among these may be mentioned 

 deltoides (the Maiden Pink), neglectus, 

 and superbus, all with rose-coloured 

 flowers. They are very brilliant. 

 Seed of most of the Dianthuses 

 can be obtained from seedsmen who 

 specialise in hardy flowers, and may 

 be sown in spring or early summer. 



Geraniums. One or two of the hardy 

 Geraniums, or Crane's-bills, can be 



(2,299) 



grown on the rockery if capacious 

 pockets have to be filled, but they 

 should be kept under surveillance 

 or they will overrun smaller, weaker, 

 and perhaps more valued neighbours. 

 Lancastriense, rose, is one of the 

 best; it blooms with great profusion, 

 and is bright and vigorous. Propa- 

 gation may be effected by division. 



(i) Helianthemums (Sun Roses). These are 

 real friends to the rock gardener who 

 cannot afford choice and expensive 

 plants, for they are very cheap, spread 

 freely, and are brilliant in colour. 

 They form very bright and glowing 

 patches when in full bloom. Pro- 

 pagation is by seed or division in 

 spring. 



Linaria alpina (Alpine Toadflax] A pretty 

 plant, with violet and yellow flowers. 

 Propagated by division. 



(i) Lithospermum prostratum. One of the 

 most valuable plants, on account of 

 its profuse blooming and deep blue 

 flowers. Propagated by division. 



(i) Poppies. The Iceland Poppies (Papaver 

 nudicaule and its varieties), referred 

 to under Herbaceous Plants, may be 

 pressed into service for the rockery. 

 They are bright and free-flowering. 



(i) Primulas. Several of the hardy Prim- 

 roses, notably farinosa, with lilac 

 flowers, and viscosa, purple with 

 white centre, bloom in summer, and 

 are charming for the rockery. Pro- 

 pagated by seeds or division in 

 spring. 



(i) Saxifragas. Several of the best 

 species, among which hypnoides and 

 longifolia, both with white flowers, 

 are prominent, are summer bloomers. 

 Propagated by division. 



(i) Sedums (Stonecrops}. These low-grow- 

 ing, dense, free-blooming plants are 

 great favourites with rock gardeners, 

 and justly so, for they are both 



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