Available in two sizes these cute little worms get poked into the soil next to your plants, & being made from terracotta will turn dark when the ground is moist, letting you know that your plants are happy & hydrated. When the soil starts to get too dry, Willy will change to a lighter colour to let you know it's time to get the watering can out. The extra large Willy the Worm comes in a full colour gift box, & the small Willy comes as he is. Terracotta water sensor Appears dark when plants are hydrated Appears pale when it's time to water plants Extra large Willy: 30.5cm long (comes in gift box) Small Willy: 10cm long Made from terracotta