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Some of the newest compost bins promise to do their work in just a few weeks and with minimal fuss. That's wishful thinking, judging by our tests.
Slow decay. In our test of composting conditions, we found that it took 8 to 10 weeks to see fine, dark material that resembles compost. In nine weeks, the low-rated Tumbleweed turned leaves and grass clippings into large, odorous clumps.
Chemical analysis of some 21-week-old material showed that it hadn't fully decomposed. It contained levels of ammonia that can stunt sensitive seedlings and potted house plants.
Even when compost looks ready, we found that it often needs at least eight to nine weeks more to be safe for all garden uses. One way to know when compost is ready: Put a small amount in a pot with radish seeds. If the seeds germinate and grow, the compost is mature.
Pitching in. Composting works best if you turn the ...