Rot wood is well-rotted hardwood used as a long-term grazing food for millipedes. Fresh timber is not suitable: it is too hard, too dry and usually lacks the microbial growth that makes decayed wood useful. For many species, the value of rot wood is that it adds both food and a feeding surface inside the enclosure.

If you want a broader overview of feeding, see What Do Millipedes Eat? Complete Feeding Guide.

Is rot wood right for your millipede setup?

The rot wood you want should be soft, crumbly and clearly decomposed. It should look like wood that has spent a long time breaking down on a damp woodland floor, not like fresh-cut timber that has simply been weathered outside.

Well-rotted hardwood is usually the best choice. As it decays, the fibres soften and the surface develops fungi, bacteria and biofilm that millipedes can graze on. That is what makes rot wood useful over time.

Fresh wood is not a substitute. If it still feels hard, dry and dense, it is not decayed enough to serve as food for millipedes.

Rot wood works best as part of the enclosure's food base rather than as a standalone item. Used alongside leaf litter and a mature organic substrate, it becomes part of the environment the animals feed through and live in. For more on that relationship, see Why Is Rot Wood Important for Millipedes?

How much and how often

Keep rot wood available in the enclosure rather than treating it like a measured meal. Millipedes graze slowly, so the goal is to maintain a stable supply of suitable decayed wood that can be used over time.

There is no single amount that suits every setup. Species, group size, temperature and the maturity of the enclosure all affect how much is needed. In a well-established setup with plenty of leaf litter and organic substrate, the wood may be only one part of a broader feeding base. In a newer or less mature enclosure, you will usually need to watch the setup more closely.

Do not worry if the wood is not eaten quickly. Unlike cucumber or squash, rot wood is not meant to disappear in a single feeding session. It should remain available as a long-term grazing resource. If you want a fuller picture of how different foods fit together, see Leaf Litter vs Supplemental Food for Millipedes.

What to watch

Healthy rot wood is soft, slightly springy or crumbly, and visibly decomposed. It usually has an earthy woodland smell. If it stays hard, dry or unchanged for a long time, it is probably not decayed enough to be useful.

The simplest signs that it is working are usually quiet ones: millipedes sheltering under it, grazing on softened areas, or using the cracks and cavities it creates. A piece does not need to vanish to be useful.

Adjust the feeding base if you notice these signs:

• Rot wood remains hard and unchanged - it may be too fresh or too dry.


• Little activity around the wood - the wood may not be at the right stage of decay.


• The enclosure looks clean but lifeless - there may be too little leaf litter or mature organic matter.


• Sour or stale conditions - moisture, airflow or drainage may need attention.


• Supplemental food disappears quickly but the substrate is poor - the long-term food base may need improving.

A good setup should look like a functioning woodland floor: wood, leaf litter and substrate slowly breaking down together. If you are balancing that against other foods, see Best Food for Millipedes.