Leroy and his grandad hope to win the Glenford Gardening Competition and be featured on the local news. Leroy is keen to help so Grandad puts him in charge of watering, with instructions to add one drop of Grow Magic to every can of water.But Leroy is too busy daydreaming and tips in the whole bottle by mistake! What will Grow Magic do to Grandad’s veggies... and the local bugs?