Year 3 Science Investigation.- What do plants need to grow well?

In Science, Year 3 have been investigating what plants need to grow well. After ten days of growing water cress, we observed the effects of not watering, keeping plants in a fridge, keeping plants in a dark cupboard and keeping plants on our window sill. All plants except the one we decided not to water were watered daily. Our conclusion was that plants need water, heat and light in order to grow well.