Maybe this has been posted before.

I had a few 2 liter plastic pop bottles and tried using them to pot up my seven week tomato plants.

I cut off the tops of the bottles just where they start to curve up toward the neck.

That worked, but I got another idea to improve it.

I folded over the top 1/2 inch of plastic and crimped it down with my fingers and pliers.

Now there's no sharp edges of plastic.

And I thought a bit, and realized that I can take the discarded top, push it into the cut-off top of the bottle, then draw it back up to cork the opening.

This works since the folded-over plastic rim is now smaller than the bottle's top.

I'm going to plant more of my tomatoes in these improvised pots, and with the bottle's top popped back into place, it's like an instant cloche.

So this will protect the plants while they're outside for hardening off.

I bought a cheapy sodering tool to use when making bottom holes and the holes for the twistie ties. Do this outside so you don't breath the chemicals.

I haven't made one myself yet, but heard it works from others.