This grower is sure of this plant identification.
Delosperma nubigenum produces yellow flowers. It has not flowered yet so we do not have a picture of the plant in flower.
Delosperma genus. This genus consists of densely branched trailing, perennials which are sometimes shrubby succulents, some with tuberous roots. The leaves are borne in opposite pairs. The flowers are disc-shaped brightly coloured and will bloom in the summer.
They are frost tender, min 5C, and will require full sun and very well drained soil.