Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.
Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.
Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.
Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.
Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.
Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.

Extra Large Willy the Terracotta Worm Water Sensor - changes colour as the soil drys out.

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Willy the Worm is a water sensor.
He's made from terracotta.

Pop him in the soil and he will change colour. He will be darker when the soil is wet and lighter when the soil it dry.

30.5cm tall.
Willy arrives with a sticker round his neck which is easy to remove (shown in photos).