As always, there are several ways to cast the base. Depending on where it will be used ultimately, select cans of various sizes, for a large base, I use a large coffee can. But smaller cans have their place as well. I decided to use a plastic flower pot as a form in order to make a more attractive post base.
Step 2: Parts and supplies needed
Start with large coffee cans that you would other wise toss into the landfill. Also needed: any posts or stakes you have or want to make. I have made them out of old fence boards, new lumber, old moulding, etc. What you want is slender stakes or posts of 1 to 2 inches wide and 3 to 6 feet in length. Then we need some concrete, either sack mixed, or make your own. A good tactic is to plan on making these posts when you have another project going, like a sidewalk, patio, retaining wall, etc. Then you need water, a place to mix the concrete, a trowel or scoop, and so on.
Step 3: Place post into form and add concrete
Putting the post in the can or form in which you will place the concrete: It might be a good idea to drill a hole in the post and add an old bolt or nail to make the post more secure in the can.
Step 4: Add Concrete to the can or form used.
Try to have can on a level spot so that you end up with a true plumb, vertical post.
Step 5: Plumb post in can
Post can be moved slightly to have it as near straight vertical as possible.