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Here is my 2 cents worth .. Let's also hear from other Adepts their methods too please!
After the flower is gone you will be left with little green capsules if the flower was successfully pollinated. The green capsules will grow bigger and bigger and finally turn brown. Inside you will find brownish black seeds.
Canna are hard coat seeds. What this means is you have to put a hole in the coat in order for it to germinate. Just a little one .. enough to see white. Some people use a nail file, I use my dremel tool and drill.
Once you have your hole in it, soak it overnight in hand hot water then plant it about 1/2 inch deep in some good potting medium. They can take anywhere from 1 - 6 weeks to show up. If you plant them early enough they will bloom the first year.
The neat thing about growing canna from seed is that you will never know what you are going to get. They don't always breed true to the parent. So don't be surprised if your home grown canna doesn't look anything like the plant you got the seeds from!
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