HARDY SHRUBS 327 



beginning of May the graft will have made considerable growth; 

 each one should then be supported with a stick, else it is liable to 

 become detached from the stocks. Division should only be at- 

 tempted with plants which are well provided with short growths 

 from the bases of the plants. 



PAULOWNIA (Empress Tree). Under favorable conditions 

 P. iomentosa (imperialis) grows into a good-sized tree. During 

 May, before the leaves appear, the large panicles of bright purple, 

 gloxinia like flowers open out, making a most gorgeous appearance. 

 A medium sized tree will ripen an almost incredible number of seeds; 

 they are quite small and need careful tending to germinate them 

 successfully. Young plants, when cut down annually, throw up 

 very strong shoots with leaves sometimes 2 feet in diameter, giving 

 an effect not to be had with any other plant. It thrives in any soil. 

 It is hardy in the North, but the flower buds, being naked, are 

 usually killed by severe frosts. 



PHILADELPHUS (Mock Orange. Syringa). All of the 



species and their forms are valuable flowering shrubs with large 

 white flowers, some of which are very fragrant. P. coronarius is 

 one of the best known; P. c. primulmfldrus has double flowers; there 

 is another, P. c. foliis aiireis, with yellowish leaves. P. grandiflorus 

 is a native of the Southern States; it has larger flowers than P. 

 coronarius. P. Lewisii is a late bloomer, with almost scentless 

 flowers. Pruning should be done only after the flowers have faded. 

 This will give the young wood an opportunity to ripen. The 

 flowers are only produced on the wood made the preceding Summer. 

 They succeed in almost any soil. 



Propagation. Cuttings taken after the leaves drop in Autumn 

 will root very quickly if put in slight bottom heat in March or 

 April; or in a protected place they root well in the open ground. 



POTENTILLA (Shrubby Cinquefoil). P. fruHcosa is a very 

 hardy species growing from 2 to 5 feet high, with pinnate leaves and 

 numerous bright yellow flowers, which are produced all through the 

 Summer. Small plants are very suitable for the rockery, and by 

 pruning in the Spring they are easily kept within bounds. 



Propagation. Cuttings may be rooted at any time indoors 

 during Summer. 



PRUNUS (Plum. Cherry. Almond. Peach). The genus 

 Prunus includes many species of stone fruits of which some are of 

 ornamental value. The Cherry Laurel or English Laurel (P.Lauro- 



