Cutting back and repotting my poinsettia (Euphorbia pulcherrima)

Most poinsettias are thrown out shortly after Christmas, but mine was quite happy where I'd put it on the windowsill, but over the last couple of weeks it had started to grow through the coloured bracts so I thought I'd cut it back and repot it.

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Short link to:
The Felco Model 7 secateurs I've used for years: http://amzn.to/29MIwV1
The potting up tray: http://amzn.to/21bS38A
The 7cm square black pots: http://amzn.to/297nk8t
Plastic plant labels: http://amzn.to/29ad54E
Hadopots 5L Polythene plant pots (pack of 50): http://amzn.to/29MRG3U
Black, round, rigid 5L plastic plant pots (pack of 10): http://amzn.to/29N10VF