The Hertfordshire Naturalist 2018 was mailed to members in September 2018. It includes articles on:
- Lacewings and allied species in Hertfordshire
- Rare bat travels from Latvia to Rickmansworth
- Common Knapweed ? not so common in Hertfordshire?
- Appraising chalk streams using citizen science
- A life with badgers
- Veteran trees, why are they important?
- River restoration
- Prior's Wood
Also: county recorders' report and the annual report of the HNHS Management Committee for 2017-18.