"But, but, but" interrupted Lizzie. "I'm constantly cleaning up needles from our Christmas tree inside in December. So they do fall off!"
"Well, they wouldn't if we didn't cut them down and bring them indoors" said Scary. "Trees that are cut down cannot take up water any more. As the tree loses water, the needles are unable to make food any more, so they fall off."
"I don't think we should cut down a tree this year then," said Lizzie. "Maybe we could decorate a tree out in the garden instead. One that would stay living and still look Christmassy. We could dress it with lights and decorations, and maybe some gifts for the birds," she continued thoughtfully.