64 THE BOOK OF BULBS 



grown in frames or in pots in greenhouses. They have 

 pretty Crocus-like flowers of blue and white, and should 

 be planted in rich, light soil in a sunny position, well- 

 sheltered from wind, or in a frame. Slugs are very 

 partial to them, and must be carefully guarded against. 

 The leading species are cyano-crocus and violaeflora. 



TRILLIUMS 



The Trilliums, or Trinity Flowers, are very orna- 

 mental plants, and are so distinct in form that they 

 please everyone. They like shade and a moist peaty soil. 

 Grandiflorum is a general favourite, with its large 

 flowers of pure white. There is also a rose-coloured 

 form named grandiflorum roseum. Even finer than 

 grandiflorum is sessile var. californicum, which is con- 

 siderably taller, and has fine white flowers, those of the 

 typical sessile being purple. Cernuum, erectum, erec- 

 tum album, nivale, petiolatum, recurvatum, and 

 stylosum are all pretty, the last being the latest to 

 bloom, and well worth growing. Plant in autumn or 

 spring, with the crown one or two inches below the 

 surface of the soil. 



