A new and distinct Ilex plant named ‘RLH-IO-1’, characterized by its low-growing to spreading/trailing and mounding plant habit; vigorous growth habit and moderate growth rate; moderately freely branching habit; strong and flexible lateral branches that resist cracking, breakage and splitting; dark green-colored leaves that are initially bright green when developing; color is maintained throughout the year in full or partial sunlight conditions; and good garden performance, winter hardiness and tolerance to stresses, pathogens and pests common to Ilex plants.
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