What is the common name for Buddleja davidii?

The common name for Buddleja davidii is indeed the Orange-Eye Butterfly Bush. This plant is well-known for its vibrant flower clusters that attract butterflies, particularly due to its nectar-rich blooms. The name "Butterfly Bush" reflects its strong association with these pollinators, making it a favored choice for gardeners looking to attract wildlife to their landscapes.

In contrast, the other options refer to different plants with distinct characteristics. Flowering Quince is a shrub belonging to the genus Chaenomeles and is known for its early spring flowers and edible fruit. Winterhazel pertains to the genus Corylopsis, which are valued for their fragrant yellow flowers that bloom in late winter to early spring. Rockspray Cotoneaster, from the genus Cotoneaster, is recognized for its ground-covering ability and attractive red berries but is unrelated to Buddleja.

Overall, the name Orange-Eye Butterfly Bush encapsulates both the species and its appealing features, confirming its identity as Buddleja davidii.