Collect acorns in the autumn, look for ones that have been undamaged by pests. This is a good time to discuss the lifecycle of the oak tree with pupils and study other trees in your local area.
Learn more about oak trees here.
As deciduous trees (die back to wood in winter) the seeds of oak need a cold winter to break down the outer seed coat. Then once it warms again in the spring they start to grow. Putting the arons in the fridge for 1-2 weeks can simulate this cold so they will grow in the warmer classroom. This is a time to talk to your pupils about why the seasons are important for our plants and wildlife.
Plastic drinks bottle
Sugar paper, blotting paper or paper towels
Gravel or sand