It's a mallow (Lavatera.) Leave it to do it's thing for now while flowering but you can cut them right back, almost to the ground, in spring and they nearly always grow back strongly. You can cut it back less drastically after flowering to tidy it up. They are relatively short lived so it may just die on you one year.
A trowel in the hand is worth a thousand lost under a bush.
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It's a mallow (Lavatera.) Leave it to do it's thing for now while flowering but you can cut them right back, almost to the ground, in spring and they nearly always grow back strongly. You can cut it back less drastically after flowering to tidy it up. They are relatively short lived so it may just die on you one year.