There is a website-Gardenweb.com.I have been a memeber for many years.They have a winter sowing forum using soda bottles and anything else you can put dirt in.There are a lot of uses for them....I am a winter gardner.I grow Hellebore plants and my yard is in full bloom and green all year around.I love sewing so thats why i want to do some quilting.....the website if FREE to join........check it out