Knowm,
The plastic on the pellets is not biodegradable! It just gives them a better chance as to spread the roots faster and become stable in it's new pot.Just a stress thing for me.You don't have to! Makes good practice,though!That's just what I have done in the past! I use the greenhouse flats now! 18 or 32 per tray! You don't disturb the roots and you can use them again and again! You see the roots at the bottom of the pot,through the slits for drainage.

Ga Grown