II.— UNDESIRABLE PLANTS FOR THE 

 ROCK GARDEN 



While every gardener will do his utmost to keep out 

 of the rock garden such pernicious weeds as Colt's 

 Foot (Tussilago), Couch Grass, Bindweed, and others 

 that are found frequently existing in the staple soil, 

 there are certain other plants which by reason of their 

 root spread or ever-encroaching habit of growth may 

 be wholly unsuited for association with rocks, and 

 from which, when once established, they cannot well be 

 eliminated. A ^lant, too, may not be out of place in 

 the larger rock garden, but quite unsuited to the 

 majority of smaller ones. In this connection it is im- 

 portant to remember that the weed of one soil is not 

 necessarily so of all (Convolvulus althseoides is a case 

 in point). In Southern counties on chalky soils it 

 quickly finds its way into every crack and cranny, while 

 in other districts the cultivator can hardly tempt it to 

 grow. The following are to be guarded against. The 

 list is intended to be suggestive rather than exhaustive, 

 and, seeing that plants vary with soils and circum- 

 stances, the alert gardener will soon discover for him- 

 self whether a newcomer is an undesirable or other- 

 wise. 



Achillea millaefolia in any form 

 Asperula odorata 

 Calystegia pubescens (vars. ) 

 Campanula rapunculns 

 Cerastium tomentosum 

 Biebersteinii 

 Convolvulus ^Ithaeoides par- 

 ticularly on chalk soils 

 Coronilla varia 

 Euphorbia cyparissias 

 Galium molugo 

 ,, verum 



Glechoma hederacea 

 Hieracium aurantiacum 

 Muscarias (generally) 

 Oxalis Corniculata 

 Petasites (Tussilago) fragrans 

 Sedum album 



„ spurium in variety 

 Symphytums, of sorts 

 Tropseolum speciosum 

 Vancouveria hexandra 

 Vincas (generally) 



103 



