This looks very much like **Euphorbia characias**, commonly called **Mediterranean spurge**. The narrow blue-grey leaves packed around upright stems are characteristic. I’m fairly confident of the identification, but I can’t confirm the exact variety from foliage alone. ([rhs.org.uk](https://www.rhs.org.uk/plants/32728/euphorbia-characias/details?utm_source=openai)) It’s an evergreen perennial that produces large heads of **lime-green flowers in spring**, and grows best in sunshine with well-drained soil. The pink flowers behind it appear to belong to another plant. ([rhs.org.uk](https://www.rhs.org.uk/plants/32728/euphorbia-characias/details)) **Take care when handling:** euphorbias release a milky sap when cut or broken, which irritates skin and eyes. Wear gloves when pruning and avoid touching your face. ([rhs.org.uk](https://www.rhs.org.uk/plants/32728/euphorbia-characias/details))