Clematis 'Zo23015' (GLORIOUS RED) features intensely red-colored flowers with a diameter of 8 to 10 cm. It blooms from June to September. GLORIOUS RED is moderately winter-hardy (zone 6) and is best pruned in March to a height of about 25 cm. This Clematis belongs to the Viticella group and was bred by J. van Zoest Beheer BV from Boskoop. Plant breeder's rights have been applied for. The plant will be available on the market from August 2023 through J. van Zoest BV, which has also submitted the plant for novelty evaluation.