Sweet William catchfly

Silene armeria

Find more about this plant om Wikipedia. 

Enlarge

Sweet William Catchfly - You do communicate your emotions. The answer you planted into the fourth of thirty plant beds in the Dijksgracht park, part of the Twijfel Zaaien/Raising Doubts project. Latin name: Silene armeria Artist family: Romantic Colour: Purple

The plant is said to be emollient and is used in baths or as a fumigant. The juice of the plant is used in the treatment of ophthalmia. Source: https://pfaf.org/