Greenhouse management

Yesterday we have worked together on the nature and environment. We walked in a forest to arrive at the greenhouse of Chateauroux. A politican talked to us and Mr Benz translated everything into english. He talked about how the greenhouse influences the environment in Chateauroux. Its good for Chateauroux and the world.
The greenhouse has lots of plants and a tropical garden with bananas plants and lots of other stuff. It was very interesting and beautiful.
The caretaker explained us how they stop the insects that want to eat the plants. They use coloured bug traps to attract the insects. The blue one attracts the female insects and the yellow one attracts the male insects.
They are important because they are used instead of sprays and they are more ecological.