Answer: There are a number of cannas featuring brilliant foliage, and what you describe sounds normal for 'Tropicanna'. It has hot orange blooms over purple foliage that becomes striped with green, yellow, pink and red. As the foliage matures it changes colors. There's really nothing you can do to make the foliage hold its burgundy color - the color change is normal and natural for 'Tropicanna'. If the blooms are yellow rather than orange, you may have 'Minerva' rather than 'Tropicanna'. The foliage on 'Minerva' is green with yellow stripes and no red or purple at all. Hope this clarifies things for you!
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