Gardening Questions spotty leaves

You could try an anti fungal treatment. It could be mildew. I don't think Canna's are particularly prone to this, since I have a lot of them and have never seen this problem on them. There's a first time for ebverything.

thanks for that.another question is that the plant is called a lilly,i am allergic to lillies will this plant have the same effect as other flowering lillies ???.

As far as I know they are a completely different family to Lilies.

thanks for your help. As you can possably tell i am quite new to tropical plants.