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or go to walmart and buy a five gallon bucket used for mopping, or find a friend with cats who uses the buckets for litter and wash them out, or go to home depot and buy empty 5 gallon buckets, or go to a construction site and get some for free that are being tossed......
there about 80 million things you could use out there that are better then cardboard or plastic milk jugs. If you're growing outside both of those containers will not have enough room for your plants to grow.
Honestly, if i were you, id buy some wood and construct a small box. That way you can fill it with all the soil you want, have multiple plants growing in it at once, and they'll have a good amount of room to grow in.
your description makes me think of you sticking your plants in some urban area by some abandoned shed. they will stick out like sore thumbs sitting on a slab of concrete. At least put them in some tall grass or something.
-------------------- "Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln
"There are a thousand hacking at the branches of evil to one who is striking at the root" ~ Henry D. Thoreau Strike The Root
you can do 4 plants in a 3x3 box with no problem. A friend of mine, before he left the country heh, used to grow that way. Got some damn tasty nuggets from it too. Sure you can't cram it full of herb, but damn, done right 4 plants can give you a nice amount of smoke for a small space
you don't really need drainage per se. Here, this is from that thread i linked you too.
Watering Watering is, on average, done once every 3-4 days, when we give 10liters (2.5gallon) water that is fed with Biogreen nutrients. Watering is made easy by pouring the water from a can into drainage tubes that run into the earth, on the bottom of the box, where the water is evenly distributed over all soil. Moment of watering is decided by our tensiometer, an accurate soil moisture sensor. It is important that the soil doesn’t dry out too much because it then loses the “power” to absorb the water from the bottom of the box.