PERENNIALS FOR DIFFERENT PURPOSES 233 



J. PERENNIALS WHICH SHOULD BE TREATED AS BIENNIALS. There 

 are certain plants generally known as perennials which will "run out" 

 in the average garden after a period of two to three years. They 

 may still continue to grow, but after the first two years they are 

 much less vigorous. The plants in this group should be planted 

 with the idea that at the end of two years the old plants will be re- 

 moved and new ones put into their places. 



Antirrhinum majus Hedysarum coronarium 



Snapdragon French Honeysuckle 



Bellis perennis Lunaria annua 



English Daisy Honesty 



Campanula medium Lychnis alba 



Canterbury Bells White Pink 



Campanula pyramidalis Lychnis coronaria 



Chimney Bell-flower Mullein Pink 



Dianthus barbatus Lychnis dioica 



Sweet William Red Campion 



Digitalis purpurea Viola cornuta 



Foxglove Tufted Pansy 



Glaucium luteum Viola tricolor 



Yellow Horned Poppy Pansy 



K. PERENNIALS TO BE TRANSPLANTED FREQUENTLY. There are 

 certain perennials which require special attention for their best devel- 

 opment. The perennials in this group should be taken up, divided, 

 and replanted every two or three years, as they grow more vigor- 

 ously and multiply faster than the other groups of perennials. 



a. To be divided every two years: 



Anemone japonica Lychnis coronaria 



Japanese Windflower Mullein Pink 



Aquilegia Monarda didyma 



Columbine Bergamot 



Chrysanthemum (hardy, large- D / \ 



flowered varieties) P % oma <! n Y 3 " 6 ^ . . . , 



Hardy Chrysanthemum Peon y ^ to multl P ! y) 



Helianthemum croceum Phlox pamculata 



Rock Rose Garden Phlox 



Helianthus Rudbeckia 



Hardy Sun-flower Cone-flower 



b. To be divided every three years: 



Armeria (in variety) Phlox paniculata 



Sea Thrift Garden Phlox 



Iris (all varieties) Thymus serpyllum lanuginosus 



Iris Downy Thyme 

 Viola (in variety) 

 Violet 



