Materials
| Material | Categories | Description |
|---|---|---|
| Maple pruning fines | ||
| Maple seeds | ||
| Maple twigs | ||
| Maple wood chips | ||
| Oak bark | Featured | Bark of oak trees |
| Oak leaves | Fresh leaves from Oak tree that have been collected during tree pruning activities in August 2020 in Hamburg. | |
| Oak pruning fines | ||
| Oak seeds | ||
| Oak twigs | ||
| Oak wood chips |