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At a perennial sale once I found an unmarked canna with green leaves, and when I asked what color the flowers were, they said they didn't know. After looking at the leaves for a while, they decided it was probably yellow. Later that summer, I found they were right. How can I find that out for myself?

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Undoubtedly a genetic test could be performed. Otherwise you could take a job selling canna. Experience is a good teacher. –  JoeHobbit Dec 6 '11 at 6:44
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Maybe the leaves of ones with red flowers have a reddish tinge? –  Ed Staub Dec 6 '11 at 16:33
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Maybe they sold two different kinds and guessed? –  baka Dec 8 '11 at 13:21
    
They had many colors. –  jmusser Dec 9 '11 at 2:06
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The genetic traits that make a yellow flower will have other super subtle effects on the plant. Perhaps, the ratio of stem thickness to leaf, or leaf colour tinge. There is no doubt humans have a largely untapped ability (in modern times anyway) to see these subtle differences, sometimes subconsciously. It's due to taking the information in subconsciously that it seems only 'probable' not definite that the flowers would be yellow. So I think @JoeHobbit is right. It's simply experience. –  Lisa Jan 18 '12 at 23:22
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Orange color canna invariably has orange or yellow streaks on the leaves. Yellow cannas don't have orange streaked leaves. The almost white canna's streaks or similar variations in foliage will be very pale.

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