I really like the idea of the floating bottle! It is so simple! I guess by making the objects as light as possible, the impact of the waves will be minimal. The heavier the object, the stronger the water pushes back. Let's just ride them!
I made some suggestions for Cesars floating bottle. The container needs to be open so the plant can still breathe, but thats ok when the bottom is closed and a low piont of gravity keeps it up streight. The weight at the bottom is vital. So the top can stay open, also for rainwater to enter. I think the plant has to stay above the water so it has the possibility to drain excess water and doesn't drown. The principle stays the same. Good idea!
Very cool floating proposals of floating gardens from Peter 2 post before.
I'm trying to do the same thing cheaper, and without any welding, minimum labor, material... What if we were closer to the water (maybe as Peter said, the plant might not like it... but can try) and instead of a solid case - having a bag, something flexible. Do plants care if the earth in which they are moves a bit? Maybe after some time the earth and compost becomes compact enough...
So, this is the tunnel idea, but with plastic bottles, in a large bag to hold the earth. the structure is made of plumbery plastic pipes, using a few "T"s, where the structures are meeting we can also use rope. And... oh, it doesnt need to be plastic pipes, maybe wood resists better to UV...
Below, other variations on Peter's design (the sphere and the last one that looks a bit like an oil offshore platform on barrels). So basically it is just a bag in which there is a pot containing a plant. The bag is sealed (not all plants like that, some love to be encapsulated) and with a weight at the bottom is pulled down, inflating the top of the bag, ensuring floatation. That's super cheap design! We can create farms of those, the fact that are inflated should prevent the shocks from being fatal.
Now, to water the plant, it is more work : need to open the bag (this limitates the size to small small plants to be easy to manipulate), pull out the plant, water, put it back ... it is not very easy... So maybe... A diving bell! And perhaps adding a ring of floatation, in case the bag starts to deflate, so our plant doesnt drawn... hehehe. more ideas? Comments?