202 



HORTICULTURE 



August 14, 1909 



believe that this rose can be grown successfully and from 

 a financial viewpoint satisfactorily. 



Maryland is a profuse bloomer ! Of this there can be 

 no doubt and this very quality coupled with the greed of 

 those "grumblers" is doubtless responsible for their fail- 

 ure to cut heavy crops during the winter. When we 

 consider that each plant makes from eight to twelve or 

 more buds each crop, it is quite obvious that the taking 

 of such a tremendous crop at once is bound to admin- 

 ister a severe check to root action and while it may re- 

 cover from one such shock, a second will undoubtedly 

 weaken the stock to the extent that it will make but 

 little growth until near the end of the season, when 

 nature reasserts itself and almost anything will grow. 



If the disbudding were done from the beginning with 

 a view to maintaining the growth at different stages of 

 development, the crops would not be so large, but the 

 check to root action would be less severe and in the end 

 the quantity of flowers taken would equal if not exceed 

 the cut from plants that cropped straight through the 

 season. 



Maryland is a rapid grower and rather a heavy feeder, 

 and large supplies of water are necessary to keep the 

 food in an assimilable form. It is very important that 

 this liberal use of water be attended by frequent stirring 

 of the soil to keep it sweet and free from cakeing. 



Of insect pests red spider is about the most trouble- 

 some during the summer months and advantage should 

 be taken of every bright day to give the young stock a 

 thorough syringing. In hot weather, a second syring- 

 ing or spraying in the afternoon is of great benefit, 

 helping to cool the house, recharge the air with mois- 

 ture, and giving to the foliage that firm, rubbery tex- 

 ture so characteristic of well grown Maryland. 



Rehmannia angulata 



S£t Supplement 



This beautiful half-hardy herbaceous perennial was 

 recently introduced from central China by James Veitch 

 & Sons tlu-ough their collector, E. H. Wilson. The flow- 

 ers are produced in abundance and individually resemble 

 much those of Incarvillpa Delavayi, as shown in the 

 colored plate issued as a supplement with this number of 

 Horticulture. 



By making sowings of the seeds in March, or early in 

 April in heat, and pricking-off the seedlings as soon as 

 large enough to be handled, they may be had in flower 

 in August. When grown in pots the cultivation is the 

 same as that for the fuchsia. The propagation of the 

 plant from cuttings is to be preferred to seed sowing, 

 and the young plants come quickly into bloom. The cut- 

 tings should be struck in small pots singly and given 

 bottom heat. Cuttings taken in February and March 

 are ready, under good management, for planting out in 

 May in the open air. An open spot should be selected 

 for the bed or group. If florists would take up the pot 

 culture of this plant they would doubtless find it a ready 

 seller. 



Notes from the Arnold Arboretum 



Very few of the numerous ' species of the genus 

 Buddleia widely distributed through the tropical and 

 subtropical regions of Asia, Africa and America are 

 tolerably hardy in this latitude. One of them is Budd- 

 leia japonica which is in cultivation since many years, 

 but it is not so particularly ornamental, as the dull lilac 

 flower spikes are not very showy. Much more beauti- 

 ful, however, is the recently introduced Buddleia varia- 

 hilis from Central China. It is a graceful shrub from 

 six to eight feet high with upright or spreading and 

 often arching branches, clothed with handsome foliage 

 dark green above and silvery white beneath, lanceolate 

 in outline and from four to ten inches long. The lilac 

 fragrant flowers are borne in dense spikes from four to 

 six inches long, the individual flowers being small and 

 colored orange in the centre. Studded at the tips of its 

 branches and branchlets with its long lilac flower clus- 

 ters the shrub presents a graceful appearance and is the 

 more valuable, as it blooms during August and Septem- 

 ber, Unfortunately it is not perfectly hardy here, but 

 even if killed to the ground, vigorous young shoots 

 spring up again and usually bloom profusely the same 

 year. In addition to the type two superior varieties 

 have been introduced more recently. Buddleia variabilis 

 Veitchiana is more robust, the flower spikes are longer 

 and denser, sometimes measuring over two feet in length 

 and the more richly colored flowers have a brighter 

 orange centre. Buddleia variabilis magnifica has bright 

 violet purple flowers with a deep orange eye and more 

 constricted spikes, otherwise it is much like the pre- 

 ceding variety. The latter variety is the earliest to 

 bloom, then follows var. magnifica and after the type 

 which is the next comes a still later form, var. Wilsoni, 

 which has not yet flowered at the Arboretum ; it is said 

 to have the largest flower spikes of all, over two feet 

 long, and the flowers are of bright rose lilac color with 

 an intense orange centre. There are also some other 

 recently introduced species which have not yet flowered 

 at the Arboretum ; one is Buddleia nivea, remarkable for 

 the white fluffy covering of the stems and the under sur- 

 face of the leaves, while the upper side is dark green and 

 nearly smooth ; the flowers are not very showy, small and 

 lavender-blue and partly hidden in the white tomentum 

 of the inflorescence. Another is B. albiflora, but not 

 white-flowered, as the name seems to indicate, the flow- 

 ers being pale mauve coloring -{vith orange centre. It 

 much resembles B. variabilis, but is less beautiful than 

 the varieties of that species. 



As a new form of a well known native late-flowering 

 shrub mention may be made of Clethra alnifolia rosea 

 which is now in cultivation at the Arboretum, and 

 though it has not yet flowered here, I had the opportuni- 

 ty of seeing fresh flowers from the Watuppa Lake near 

 Fall Eiver where this form was discovered several years 

 ago. The flowers are flushed with pink outside, while 

 m bud they are bright pink. It will make a pleasant 

 contrast if planted together with the white-flowering 

 type. Clethra alnifolia, Wliite Alder or Sweet Pepper- 

 bush, is a handsome shrub and to be recommended for 

 its late spicy flowers. It should, however, not be plant- 

 ed m too sunny and dry situations, as the foliage in such 

 localities is often disfigured by the red spider and the 

 shrubs look then rather unsightly. It grows naturally 

 in swampy soil. 



