i am also interested in some info on using smart pots. i want to do a grow out in the country. the drive is about 45 minutes away so i,m looking for a good soil mix that i can use that will last for 7 days in 20 gall smart pots. has anyone tried using polymer crystals in the soil mix to help retain water? i,m experimenting right now with a 20 gall smartie but i havent come up with a good mix that will stay moist for 7 days or so. it gets real hot here for about 4 months so that will be my most important times for watering. i,m lucky to have water close by where my pots will be. thanx for any info.....peace!