The present invention relates to a new and distinct cultivar of Barberry plant, botanically known as Berberis thunbergii and hereinafter referred to by the name ‘UCONNBTB048’. The unique characteristics of this new Barberry plant include seed sterile compact, dense, low-growing habit thick and slightly leathery bright yellow spring foliage and light yellow and chartreus summer foliage adaptable to many landscape situations resistant to black stem rust disease and winter cold hardy to at least −26° C.
