Need help with Grandma's cannas

My grandmother has a cluster (approx 6ft diameter) of beautiful cannas in her front yard. There are probably a few dozen cannas in the group and I'd like some advice before I move them for her. I'm not much of a gardener and have no idea of whats the best way to go about it, or when is the best time to do it. I'm in inland Southern California, so ground penetrating frost isn't much of a problem. Here's a pic of Grandma and her cannas that I took yesterday (I think she looks pretty good, considering she's just a few weeks awy from her 98th birthday): http://hometown.aol.com/buggzzee23/myhomepage/index.html
The petals are just now beginning to thin out and drop and a few of the lower leaves are starting to deteriorate. What's next, do the plants die soon? Should I wait until they die before I dig up the bulbs? How deep are the bulbs likely to be and how many can I expect to find for each plant? Can I just pull the stalk up bulbs and all, or should I dig them out? Is it OK to immediately replant the bulbs, or is there a better time of year to do it? Any tips for how to replant, such as how deep, how far apart, etc? Can you think of any questions I forgot to ask?
I'm sorry to post so many questions, but she *really* likes her cannas, and I know absolutely nothing about them and don't want to botch the job. Any help would be greatly appreciated.
Thanks in advance, Bud
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Great looking lady for her age. The sun and good weather has deffinately agreed with her. go out about a foot away from the outer stalk with a spade and sink it in as deep as you can, then go back to the same slit and shove it deeper. Carefully pry and see if you get an indication of lifting with a stalk. They will probably be about a foot or so in the ground, and you can actually lift them with leaves on them, cut the stalks off and let them cure. Or you can take them home and plant them as they are and they'll come back next year. a good deep hole to plant them back in and water well and they'll be fine. If you nick or cut thru a stalk no harm done. The rhizome will recover. My canna's grow in mucky, gray water and leaf litter and red clay in Eastern Tennessee where the washing machine and kitchen sink drain from. My Bengal tiger canna's are seven foot, my dad's old fashioned "Indian Shot" cannas are 12 foot and the Wyoming canna I planted this summer is three foot. The Tropicanna is just two foot, and that's the iffy one. I just dug a double spade depth hole and plopped them in. Good luck, and hug yer granny for me and tell her happy birthday! madgardener up on the ridge, back in fairy holler overlooking English Mountain in Eastern Tennessee zone 7, Sunset zone 36

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