Answer: If you arrange the plants in such as way that the tulips are in clusters with perennials in front and to the side of the tulips rather than on top of them, you can use a variety of perennials. The daylilies are a good choice because the arching grasslike foliage will conceal the tulip foliage. The two you mentioned would also work but will not conceal athe tulip foliage quite as well because they have mostly low, basal foliage until they begin to bloom. Leave ample room between the tulips for your perennials -- they do spread into quite a clump in just a year or two.
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