if your speaking of feet and inches 1x1 is a bit small. a 2x2 would be better. If you train your mother plant and keep it in good health this should not be a big issue. The biggest issue with mother plants is keep them healthy. pests and disease gets in there and can alter the plant for ever and its kids to follow.
I much prefer seeds and buying clones vs keeping a mother but I have not found my Goldilocks strain just yet.
Best Of Luck!
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