Join Sarah and Mr Pottifer in their magical plant shop, where fantastical creatures grow on trees! It's nearly Christmas Day when an unexpected visitor arrives – it's Santa, and he needs their help! His reindeer are in bed with Antler Flu and without them, he can't deliver his presents on time. But growing well-behaved reindeer isn't as easy as it seems. . . and before long the mischevious creatures have created a rather MERRY MESS! Can Sarah figure out a way to save Christmas before it's too late? This rhyming story full of festive fun celebrates being different, and the importance of teamwork. Other stories in the How to Grow series: How to Grow a Unicorn How to Grow a Dragon How to Grow a Mermaid