T. 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.
As a particularly conspicuous forest flower, T. grandiflorum was designated the provincial emblem of Ontario in 1937 (Flora Emblem Act), and as the state wild flower of Ohio in 1987. As the symbol of Ontario, a stylized trillium flower features prominently on the official flag of the province's French-speaking community. It is also frequently used by the Canadian Heraldic Authority to represent Ontario in grants of arms. Although a network of laws make picking wildflowers in general illegal in the province more often than not, it is not, unlike widely believed, specifically illegal (or necessarily harmful) to pick the species in Ontario.
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