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Planting Canna Louis Cottin in pots - what size pots and how many per pot?

Pete.8Pete.8 Posts: 10,277
I've just had the above cannas delivered from J Parker.
3 packs of 3 tubers/pack - but 1 tuber is the size of a marble (see 1 o'clock in the pic)
I was planning on 3 plants/pot, but having 8 tubers I guess I'll have to go for 2 pots with 4 tubers each - what size of pot would you knowledgeable folk suggest please?
Would a mix of MPC + JI3 + grit be a good mix for planting?

Many thanks as always

Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
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