Dahlias in containers?

Lubbock, TX(Zone 7a)

This is my first official question for you established DGer's. Last year I discovered dahlias and only planted one form bareroot or bulb or whatever you call them. It was one of my favorites, with it's slow opening, long living flowers. This season I would like to try more. I want to grow them in pots so the tubers are more easily lifted for winter. I live in zone 7a and was thinking of cutting a plastic tray (like a flat tray) into a circle that would sit down in a pot so lifting will be easier in the late fall. I would like to know if this would work, what size pot they'd require, where to place the stake and what kind..bamboo?, and how much space they'd require above the "grate".

Any suggestions will be appreiciated. I'm green and would like to enjoy these dahliias for years to come.

Thank you,
Linda

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