I'm currently using black air tube with a few knots tied in various locations (to trap air) and I have strung them across the pond. This (so far) has kept my floating plants together in an area I want them in. I imagine you could tie both ends of the tubing together and create a ring for floating plants.
I used some clear air tubeing left over from my aquarium, formed it in a circle and have my lettuce all together in it, it worked out great. Thanks for the suggestion Tim
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