Botanical name: Centranthus ruber
Common name: Red Valerian
Family: Valerianaceae
Origin: Mediterranean
USDA Plant Hardiness Zone Map
The plant flowers profusely, and though the individual flowers are small, the inflorescences are large and showy.
Although it is sometimes reported to have medicinal properties, there is no basis for this view, which is almost certainly due to confusion with true Valerian.
Link to this plant:
https://toptropicals.com/catalog/uid/centranthus_ruber.htm