Human ashes are also bad for the environment because unlike plant matter, ashes don't decompose. There are a few other problems to consider when thinking about planting in cremation ashes: Cremation ashes may be harmful when placed in the soil or around trees or plants.

How long do human ashes last?

Cremains in the Ground

In some settings, cremains are buried in the ground without either an urn or a tomb. The process for degrading is relatively short. Biodegradable urns speed the process but still may take up to twenty years to degrade. Once the biodegrade happens, the body will unite with the soil quickly.

Do human ashes disintegrate?

Whether you bury or display the urn that holds your loved one's ashes, you can't go wrong. The ashes will never decompose, dissolve, or fade away for as long as you will be alive.