A new and distinct variety of landscape shrub rose plant herein referred to by its cultivar name, ‘Radgardebwhite’, is provided which forms in abundance on a substantially continuous basis attractive, double white colored blossoms. The vegetation is vigorous and the growth habit is very bushy and rounded. Attractive, semi-glossy, medium green foliage is formed. Excellent disease resistance is exhibited. Additionally, the new variety is particularly well suited for growing as distinctive ornamentation in the landscape.