After some months, you want to harvest the finished compost to use it for your
garden. The main problem is the separation of the fine compost from brush and
larger pieces that aren't compostet yet.
Depending on your type of composter, harvesting is
more or less of an effort.
In compost heaps, compost cylinders and boxes and compost
bins you have to turn the compost or rebuild the site in a new place, and
after moving all the large pieces with a pitchfork, you collect the fine
material that is left on the ground.
The 3-box-composter provides you with a space for turning the compost.
A compost tumbler is harvestet by simply turning it. The small, loose
crumbs of compost will sieve through the ventilation holes in the tumbler's
wall and fall down in the area underneath it.
Harvesting a worm composter may seem tricky. You don't want to dig the
worms out. But there is a simple method: just move all the material in the
worm box to one half of the container and load the emptied space with a fresh
mix of cardboard, paper, water and kitchen scraps. Now you leave the box alone
for a day or two, and the worms will go over to the part with the fresh food.
Alternatively you just sieve the boxes' content through a narrow sieve and
put the remaining worms and material into a freshly filled worm box.