Because this seems to be a perfect combination: worm composting is an ideal solution for composting organic material like plant material in an apartment situation and it allows you to harvest a liquid percolate, containing soluble nutrients suitable for hydroculture. All you need is 3 buckets, a drill and compost worms.
It allows you to close the circle entirely: you can use the plant rests of your window garden as a fertilizer so you don’t need to put organic waste in the bin and you don’t need to buy liquid fertilizer.
Keep in mind that you have to dilute the percolate before adding it to any plants.
The compost can be used for indoor plants you’re growing in a classical soil situation.
More information on http://www.wormsasbl.org/index.php?tar=compostez&id=33&sel=4&ssel=1&art=3