An appropriate alliteration if ever I saw one. Alliteration occurs when a series of words in a row (or close to a row) have the same first consonant sound. You pick these things up or rediscover them when your children are taught them at school. I don't think I was taught alliteration in English when I was at school. We did 'Modern English' and grammer didn't appear to be included. Speaking of series, here are a series of images of pretty pastel polyethylene pots. All are lightweight and suitable for indoor and outdoor use.