Grow Bags are more economical than terracotta, glazed ceramic or plastic pots because you can clean and reuse them for years. Because the bags are made of porous fabric, cleaning grow bags at the end of your growing season is quick and easy.
Dump & Swat
Dump out the soil and let the grow bag dry for a few days. Then swat the bag against a hard surface like a wall or fence to dislodge any remaining soil, dust and small roots that grew into the walls of the bag. For most folks, this is all you need do besides folding the bag up and storing in for the next season.
Wash in a washing machine or plastic tub
If you want to do a little more, you can wash the bags in a washing machine or plastic tub with OxiClean Versatile Stain Remover or some other environmentally friendly detergent like Trader Joe’s Liquid Laundry Detergent available at Trader Joes. Turn the bags inside out and rinse well with a hose.
You can sterilize grow bags with a peroxide or bleach solution
Another method is to fill your washer or tub with water and add a peroxide or bleach solution to kill all bacteria. If you do use bleach, make sure you rinse the bags several times with a hose to remove any bleach residue because bleach is a harsh chemical that plants don’t like.
Drip Dry and Store
Let the bags drip dry. Never dry the bags in a clothes dryer. Fold and store till next season.