This grower is fairly sure of this plant identification.
I know this is sedum aizoon but it is a taller variety then the usual stonecrop.
Sedum aizoon (Stonecrop). This is a fully to frost-hardy plant about 45cm tall stems. The leaves are fleshy and crowned with clusters of yellow flowers in early summer.
They will range from frost tender to fully frost hardy. They prefer to grow in fertile, porous soil, but can grow in most soil types. They will need full sun, and you can propagate from seed, division or cuttings.
Ground cover, walls and rock garden
Italics = data drawn from parent genus or speciesView Full Plant Finder Record