| Horse-chestnut (Aesculus hippocastanum) | | 2021-10-25 | 2021-10-25 | | Hellerud videregående skole (Oslo, Norway) |
| Horse-chestnut (Aesculus hippocastanum) | | 2021-09-06 | 2021-09-06 | | Hellerud videregående skole (Oslo, Norway) |
| Oak (Quercus sp.) | | 2021-09-06 | 2021-09-06 | | Hellerud videregående skole (Oslo, Norway) |
| Oak (Quercus sp.) | | 2021-09-06 | 2021-09-06 | | Hellerud videregående skole (Oslo, Norway) |
| Oak (Quercus sp.) | | 2021-09-06 | 2021-09-06 | | Hellerud videregående skole (Oslo, Norway) |
| Oak (Quercus sp.) | | 2021-09-06 | 2021-09-06 |  | Hellerud videregående skole (Oslo, Norway) |
| Horse-chestnut (Aesculus hippocastanum) | | 2021-09-06 | 2021-09-06 | | Hellerud videregående skole (Oslo, Norway) |
| Horse-chestnut (Aesculus hippocastanum) | | 2021-09-05 | 2021-09-05 | | Hellerud videregående skole (Oslo, Norway) |
