Do ground covers have an adverse effect on daffodils?
The two will be competing for nutrients and moisture, so the answer depends on the fertility of the soil and the aggressiveness of the ground cover. Vigorous, tall-growing, and deeply rooting plants, such as pachysandra and ivy, are likely to discourage daffodils, but they will usually do well in the company of shallow-rooted, trailing plants, such as myrtle, foamflower (Tiarella cordifolia), or creeping phlox (Phlox stolonifera).
