Diamond Enthusiast

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Aluminum cans are good, So are plastic milk bottles - If you want the pot/barrel to be solid (what is the opposite of top heavy?) you would fill the milk containers with water.
I have broken down styrofoam packing material, like the huge formed chunks that came with the computer, I broke those down into hand sized pieces, threw them in the bottom of a 55 gallon barrel (with holes drilled at the bottom fro drainage) Covered with the 'Sun Screen' material - this is a thick plastic string like material loosely weaved, it is used in Garden centers to provide bright shade. I cut it to about 6 inches wider in diameter than the barrel, laid it on top and carefully filled in with dirt, holding the extra screen material against the side to prevent the soil from filling in the space below.
In the case of a palm tree, I did not use a screen and I mixed the bottom half of the barrel with Foam chunks and dirt - Just to keep the pot lighter.
Other material I have used in large barrels and pots:
Smaller pots place up side down, 1 gallon and 5 gallon buckets placed upside down. Margarine containers filled with water, or empty - Broken pottery, shards of tiles, Lava stone Gravel, Shredded news paper in plastic trash bags, Shredded office paper in plastic bags, Logs, brick, cut up tires (old ones) PVC and ABS (Black plastic) pipe (Left overs from the job site), left over ends of 2x4s, 2x6 etc - Sawdust in plastic, saw dust without plastic (note if you are planning on growing vegetables, DO NOT use pressure treated saw dust).
Leaves, grass clippings, organic material in and out of bags - mostly out of bags since the material will compost - This is a good idea for an annual planting since the material will rot and the dirt slowly sink - At the end of the growing season I would empty the barrel, mix the organic material and soil and use that in my garden as a compost feed.
I have used whole news papers, stacked up - in that state they take a long, long time to rot - Part of the composting process requires 'loose' material which can breath. I have used bubble wrap, empty paint containers, washed out -
Basically anything can be used. Go with a material that will not rot if you want to keep the barrel as is for a long time. Use organic material (paper, wood, sawdust, leaves, grass clippings) if you want to make compost while having something nice to look at.
As for what flowers to get. I would suggest a trip to your local Wal-mart or home store Garden Center - There are so many choices and depending on what area you live in will determine what is available.
I recommend these kinds of stores for annuals, since they have low prices. Long lifed shrubs, trees, roses etc I get from my nursery.
Cheers
David
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