I am planning on building 5 3- 4ft raised boxes for my patio. I would LOVE to plant these Med. plants- large, spiky ones..bamboo etc Patio is one-side shaded. The boxes i plan to build would be generous, in that thinking 4ft deep, 3ft or more wide. So - couple of questions for your noggin - advice more than welcome. What type of plants? not into the tiny ones, wanting more dynamic, leafy, overhanging, tall as possible. Next question, lining my boxes...the cheapo stuff from poundland or more stronger stuff...hard to tear...stuff that will let water through but nothing else? ( begs the question though - pinned to sides of my containers...would damp, rot set in?? ) Finally, i am happy to got the extra mile and chisle up some of the cement work i put down...underneath the patio - just sits on layers of clay soil..nothing but clay. SO...would i be wise..to build my container..with a hole in places at bottom and allow plants to enter a few chisled holes in my cement floor.....would that suffice...worth doing? means i could grow larger things? As always, thanks for your time and look forward to your answers.