The next time you have green onions, don't throw away the white ends. Simply submerge them in a glass of water and place them in a sunny window. Your onions will begin to grow almost immediately and can be harvested almost indefinitely.
Their products are biodegradable and are primarily manufactured in Australia. The Dark Green option is their best in terms of limiting chemical exposures as it does not contain synthetics (even the adhesive is made of a natural rubber bonding agent) and is free of water or stain resistant finishes and mothproofing.