Geranium question

in Plants
Two questions about Geraniums;
1) My Geranium magnificum only repeat flowers if I cut it back hard after the first flowering. Is there any need to deadhead after the first flowering, if I am going to cut it back anyway, or does this increase the number of flowers in the second flowering?
2) Geranium oxonianum: I've read this is very vigorous, and we have it in a trough which contains it. I'd like to move some into a planting bed, but don't want it to take over. I was thinking of cutting a hole in the base of a large plastic plant pot, and sinking this into the ground to contain the roots. Has anyone tried this, or any other techniques.
1) My Geranium magnificum only repeat flowers if I cut it back hard after the first flowering. Is there any need to deadhead after the first flowering, if I am going to cut it back anyway, or does this increase the number of flowers in the second flowering?
2) Geranium oxonianum: I've read this is very vigorous, and we have it in a trough which contains it. I'd like to move some into a planting bed, but don't want it to take over. I was thinking of cutting a hole in the base of a large plastic plant pot, and sinking this into the ground to contain the roots. Has anyone tried this, or any other techniques.
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Never had any success with magnificum reflowering but the leaves turned a beautiful red later in the season