We received two 2 liter bottles that have been cut in half. Then we put gravel in the bottom half put half a string through the hole on the bottle top. We put dirt water and seeds in the top half and sealed the bottles together with tape. I’m hoping the plants will grow well and something unexpected occurs. We have reused bottles one half had a lot of dirt on it and I think it may grow mold.
Aquatic science fishy business 