Lucy asked, ‘What is the biggest tomato I can grow?’ She had one tomato plant. She looked after it really well. It had twelve tomatoes on it. They all ripened and went red. How did she find out which was the biggest tomato?

They want to find out what is needed to help plants to grow. Every person in the class has to decide what they are going to change. The class are going to use tomato plants for their investigation. The teacher buys 50 tomato plants in April. All the tomato plants are the same to start with. Whose tomato plant will grow best, and why? What makes plants grow?