In the repotting video they show to cut the bottom of the biodegradable pot won’t this harm the roots of the plant?
It depends on how established the roots have become in your seedling pot. If you can see loads of roots sprouting through the bottom of the pot then we wouldn't recommend cutting the bottom of the pot, as this could damage the root structure. In this case you should plant your seedling pot straight into the soil, as the wood pulp should break down and allow the roots of your seedling to push right through it. To assist the pot breaking down, soak the whole pot thoroughly in either water or a very diluted liquid seedling fertiliser, before planting it in the soil. Make sure the biodegradable pot is completely covered and the top lip is not left sticking out of the ground, as it will act as a moisture wick and draw water away from the roots, where it is needed. Happy growing.