A new cultivar of Delosperma plant named ‘;Banana Blast’; that is characterized by its floriferous blooming habit, its yellow flowers with white centers, its very compact and tight mounds of foliage that do not become long or leggy during the summer growing months, its strong re-blooming habit during the entire growing season and into late fall, its small plant size, its uniform rooting habit, and its uniform blooming period with other plants in the series.