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Ontario'Yours to Discover'
Ontario became a Province of Canada on July 1, 1867. 
The province's motto is Ut Incepit Fidelis Sic Permanent - Loyal She Began, Loyal She Remains.

It has a red background with the Union flag in the top left corner and the provincial coat of arms on the right side. 
Act of Legislature assented to April 14, 1965 Queen Elizabeth II's approval of use of Royal Union flag given on May 11, 1965. Flag raised on May 21, 1965

The coat of arms has a moose and a deer supporting a shield. On the shield there is the cross of Saint George representing England and three maple leaves representing Canada. The crest is a bear atop a wreath of green and gold.
Royal Warrant of Queen Victoria, May 26, 1868. 
Gazetted, November 16, 1869. 
Augmented of crest, supporters and motto by Royal Warrant of King Edward VII of February 27, 1909 
Gazetted, April 24, 1909 

In Ontario, the White Trillium (Trillium grandiflorum), also known as the wake-robin and the white lily, was officially adopted in 1937. It was recommended by a special committee of botanists to the Ontario Horticultural Association, which canvassed the views of other horticultural societies in the province, also of high schools and collegiate institutes. In a British botanical work published in 1760 there is a reference to the trilliums as "the herb True Love of Canada."
Other symbols
The white pine, the loon, the amethyst and the colours green and yellow.

Symbols used  with permission from the Canadian Government