Thanks for the answers!
Jake Esselstyn wrote:If they have free run of the place they'll develop favorite spots and turn those in to mud pits.
Is this necessarily a problem, though? I am thinking, that if they do develop these mud pits, I could adjust accordingly and grow plants that do well in those kinds of environments.
Dorothy Pohorelow wrote:...we set up a series of irrigation ditches that we dumped those tubs into each time. All the water and duck stuff went into the trenches and boy did my friend have a nice garden.
Nice idea! I know from researching that ducks make the water messy quite fast. My plan was to use the water for plant irrigation with a watering can/buckets and leave some around the bathtub. Then grow some plants in it that they can eat. But these trenches sound like a more practical and effective solution.
One problem with it is that I would like to have the tub in an area under trees (I guess it would be good, that it is shaded, right?). How deep should these trenches ideally be? I am not sure how deep (or if at all) can I dig to not damage the tree's roots.
Will the regular application of water/duck manure seal these trenches (like a pond)? I kind of like that, but won't it be bad over time, that the water/manure mixture will be sitting there anaerobically?