| 2020 | NHM website for the LNHS plant gall collection is developed and uploaded. The LNHS gall collection paper is published in the 'London Naturalist'. |
| 2019 | The collection is databased, digitised and added to the museum's Emu database. |
| 2018 | The LNHS gall collection project begins to document the collection. |
| 2010 | The collection is frozen to -30deg.C to kill possible pests and transferred to the Cocoon in the new Darwin Centre 2 Building. |
| 1995 | The collection is transferred to the British Museum (Natural History), now known as the Natural History Museum. |
| 1994 | The Passmore Museum is closed and a new home for the collection is sought. Ruth Day (LNHS President) promotes saving the collection for future generations. |
| 1988 | The collection is fully documented and a catalogue and history is published by Hollins and Plant. |
| 1976 | The collection is almost thrown away but is rescued and transferred to the Passmore Edwards Museum, Essex. |
| 1949 | Collecting is disrupted by WW2 and the last specimen is added in this year. |
| 1929 | The 1920's is the period of most gall-collecting activity, 1929 being the peak year with 40 specimens collected. |
| 1915 | When H.J.Burkill joins the LNHS he is the stimulus for the creation of a Plant Gall Section, which leads eventually to the creation of this collection. |
| 1898 | The earliest plant gall in the collection is contributed by C.S. Nicholson, but the specimen must have been added at a later date. |