A "cake" made of plant materials is on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)

A "cake" made of plant materials is on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)

A "cake" made of plant materials is on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)

A "cake" made of plant materials is on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)

Flowers planted in a pair of shoes are on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)

A bed made up of flowers is on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

Flowers planted in a pair of shoes are on display during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

People visit the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

A man views a flower in a bottle during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

A woman visits the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

A woman visits the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Zou Zheng)

A woman views flowers in bottles during the 17th Canada Blooms exhibition at the Canadian National Exhibition center in Toronto, Canada, March 15, 2013. As Canada's largest flower and garden festival, the 10-day event kicked off on Friday and was expected to attract over 200,000 visitors. (Xinhua/Ma Dan)