9 Grasses — day 1
6 Grasses — day 13
5 Grasses — day 15
30 Days measured
| Day | Cypress/Yew | London Plane | Grasses | Plantain | Olive |
|---|---|---|---|---|---|
| 1 | 1 | 0 | 9 | 1 | 0 |
| 2 | 0 | 0 | 1 | 0 | 0 |
| 3 | 0 | 0 | 1 | 0 | 0 |
| 4 | 0 | 0 | 0 | 1 | 0 |
| 5 | 1 | 0 | 1 | 1 | 0 |
| 6 | 0 | 0 | 1 | 1 | 0 |
| 7 | 0 | 0 | 2 | 0 | 0 |
| 8 | 0 | 0 | 1 | 0 | 0 |
| 9 | 0 | 0 | 1 | 0 | 0 |
| 10 | 0 | 0 | 2 | 1 | 0 |
| 11 | 0 | 0 | 1 | 0 | 0 |
| 12 | 0 | 0 | 4 | 0 | 0 |
| 13 | 0 | 0 | 6 | 0 | 0 |
| 14 | 0 | 0 | 1 | 0 | 0 |
| 15 | 0 | 0 | 5 | 0 | 0 |
| 16 | 1 | 0 | 2 | 1 | 0 |
| 17 | 0 | 0 | 4 | 0 | 0 |
| 18 | 0 | 0 | 1 | 0 | 0 |
| 19 | 1 | 0 | 1 | 1 | 0 |
| 20 | 1 | 0 | 1 | 1 | 0 |
| 21 | 1 | 0 | 1 | 0 | 1 |
| 22 | 0 | 0 | 2 | 0 | 1 |
| 23 | 0 | 0 | 1 | 0 | 0 |
| 24 | 0 | 0 | 1 | 0 | 0 |
| 25 | 0 | 0 | 1 | 0 | 1 |
| 26 | 0 | 0 | 1 | 0 | 0 |
| 27 | 0 | 0 | 1 | 0 | 0 |
| 28 | 1 | 0 | 3 | 0 | 0 |
| 29 | 1 | 0 | 0 | 0 | 0 |
| 30 | 2 | 0 | 1 | 0 | 0 |