Cannas: For the Canna Tyros - How to Grow Canna From Seeds, 1 by Xeramtheum

Xeramtheum wrote:
Go for it! I Start my canna in pots pretty much anytime. I keep them in the pots for about a year or so. This gives them time to grow healthy and strong rhizomes before being subjected to "real life in the canna bed".

If I start some in late winter or fall, I don't let them go completely dormant so the rhizomes continue to grow (I have a greenhouse). I set the pots on 2ltr soda bottles, laid on their sides, painted black with water in them, "passive solar heating". The warmth in winter from the bottles keeps the soil above 65 degrees.

The latest I will put canna in the ground is early August.

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