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PBAGTIGAL GUIDE TO GARDEN PLANTS cbdeonblla 



for rockeries, beds, or the front of shrub- 

 beries and borders in good sandy loam. 

 It likes plenty of moisture in summer 

 but should be protected from cold rains 

 in winter. Slugs are very fond of the 

 young growths and should be watched for 

 in spring. Increased by seed and careful 

 division. 



D. imberbe. — A Siberian perennial 

 about 6 in. high, with tufts of long- 

 stalked heart - shaped reniform leaves 

 having crenate-toothed margins. Flowers 

 in summer, lilac-blue, borne in whorls. 



Culture dc. as above. 



D. Moldavicum. — A strong but rather 

 agreeable smelling annual species l-lj ft. 

 high, native of E. Siberia, with lance- 

 shaped orenulate leaves. Flowers in 

 July and August, blue, in long nodding 

 racemes. There is a variety having white 

 flowers. 



Culture dc. as above. Raised from 

 seeds sown every spring under glass and 

 transplanted, or in the open border in 

 light soil, and thinned out. 



D. parviflorum. — A decumbent Sibe- 

 rian perennial having short-stalked lance- 

 shaped toothed leaves about 1 in. long, 

 smooth above, and somewhat hoary be- 

 neath. Flowers in summer, blue, 1-li 

 in. long, or spikes 12-18 in. long. 



Culture dc. as above. Suitable for 

 parts of the rookery or border in Hght 

 well-drained soil. Increased by seed and 

 division in spring. 



D. Ruprechti. — A compact-growing 

 perennial 6-18 in. high, native of Tur- 

 kestan, having ovate lance-shaped vari- 

 ously cut and toothed leaves. Flowers in 

 summer, rosy -purple or lilac, about 1 in. 

 long, in axillary clusters. 



Culture dc. as above. Similar treat- 

 ment to Z). parviflorum. 



D. ruyschianum. — A handsome peren- 

 nial 12-18 in. high, native of the Alps 

 and Pyrenees, having numerous erect 

 downy stems and smooth linear lance- 

 shaped entire leaves 1-1^ in. long, with 

 revolute edges. Flowers in early summer, 

 purplish-blue, about 1 in. long, and about 

 6 at the top of each stem. 



The Japanese form of this species 

 known as japonicum is a much finer 

 plant than the type. It has beautiful 

 violet-blue flowers with a broad white 

 lip edged and dotted with violet. They 

 appear from June to August, and. if not 



allowed to produce seeds will continue 

 until September and October. It may be 

 increased in the same way as the typical 

 D. ruyschianum. 



Culture cmd Propagation. — This 

 pretty species looks effective in the 

 rockery or border, and prefers warm light 

 soil in partially shaded situations. It 

 may be increased by dividing the clumps 

 in spring, and also by sowing seeds in 

 light rich soil in April and May, after- 

 wards transplanting when well established, 

 or thinning out, and allowing the remain- 

 ing plants to flower where sown. These 

 may, if necessary, be transplanted to other 

 parts the following spring. 



D. speciosum. — A beautiful Himalayan 

 perennial about 18 in. high, with long- 

 stalked, broadly heart-shaped, wrinkled, 

 green leaves, downy beneath. Flowers 

 in June, pinkish-blue or lUac, with darker 

 coloured spots on the hp and crowded 

 into dense oblong spikes 1-4 in. long. 



Culture dc. as above. Suitable for 

 the border or rockery in light well-draiDed 

 soU, and warm sheltered positions. 



CEDRONELLA. — A genus closely 

 related to Dracocephalum, and contain- 

 ing a few species of herbs or shrubs with 

 toothed or 3-parted leaves. Calyx tubular 

 or bell - shaped, 13-15 - nerved, equally 

 5-toothed. Corolla 2-lipped. Stamens 4, 

 didynamous, with anther cells parallel 

 instead of diverging as in Dracocephalum. 



Culture and Propagation. — These 

 plants flourish in ordinary good and well- 

 drained garden soil, but prefer a rich 

 sandy loam to which some peat and leaf 

 mould has been added. Most of the 

 species may be easily increased by divid- 

 ing the roots in early autumn, or in spring 

 as growth is about to commence. Cuttings 

 of the non-flowering shoots will also root 

 in sandy soil under a handlight, or in a 

 cold frame in spring and early summer. 



C. cana. — A pretty hoary evergreen 

 fragrant species 2-3 ft. high, native of 

 New Mexico, having ovate-oblong toothed 

 leaves. Flowers in July, bright purple 

 or crimson, in numerous spikes. 



Culture dc. as above. This species 

 flourishes in rich sandy loam and peat, 

 with a little leaf soil. It may be in- 

 creased by cuttings of the young wood 

 in spring and eai-ly summer under hand- 

 lights, or by dividing the roots in spring. 

 Not hardy in bleak exposed situations in 

 severe winters. 



