 Trillium grandiflorum is one of the most popular trilliums in cultivation , primarily because of the size of its flowers and its relative ease of cultivation . Although not particularly demanding , its cultivation is a slow and rather uncertain process , due to usually slow growth , wide variations in growth speed and sometimes capricious germination rates . As a result , the vast majority of plants and rhizomes in commerce are collected in the wild , and such heavy collecting , combined with other pressures such as habitat destruction and grazing , may effectively endanger the plants in some areas . This also creates tensions between Trillium enthusiasts and conservation proponents . Transplantation ( as with almost all non @-@ weedy wild plants ) is a delicate process , and in many cases results in the death of the plant . In cultivation , T. grandiflorum may flower in as little as 4 to 5 years after germination ( compared to the usual 7 to 10 in the wild ) , but these cases appear to be exceptions rather than the rule . One study revealed 20 or so individuals performing so well out of about 10 @,@ 000 seeds planted , only 20 % of which germinated after a year . However , barring plant destruction , T. grandiflorum can continue flowering every year after it has begun . 
