The "Bi-Color" Butterfly Bush (Buddleja davidii 'Bi-Color') is a popular cultivar known for its pink to purple spikes. Here are some key features and care tips for the Bi-Color Butterfly Bush:

1. Flower Color: The most distinctive feature of Bi-Color is its rich pink to purple flower spikes. The color is intense and makes a striking contrast in the garden.

2. Size: Butterfly bushes are generally fast-growing and can reach a height of around 6 to 8 feet, with a similar spread. They have an upright, arching growth habit.

3. Flowering Period: Butterfly bushes are renowned for their long panicles of flowers, and Bi-Color is no exception. The bloom period typically occurs from midsummer into fall, attracting butterflies and other pollinators.

4. Sunlight Requirements: Like most butterfly bushes, Bi-Color prefers full sun. Providing ample sunlight helps ensure vigorous growth and abundant flowering.

5. Soil Conditions: Well-draining soil is crucial for butterfly bushes. They are adaptable to various soil types but thrive in moderately fertile soil.

6. Watering: While established butterfly bushes are relatively drought-tolerant, regular watering during dry spells promotes healthier growth and flowering. Ensure the soil does not become overly dry.

7. Pruning: Regular pruning is beneficial to maintain a more compact and bushy shape. Pruning is often done in late winter or early spring, removing dead or weak wood and shaping the plant.

8. Fragrance: Butterfly bushes are known for their sweet fragrance, which adds to their appeal in the garden. The scent of Bi-Color's flowers can be quite pleasant.

9. Wildlife Attraction: In addition to attracting butterflies, butterfly bushes can also attract hummingbirds and other pollinators.

Proper care, including regular watering, pruning, and providing adequate sunlight, will contribute to the health and beauty of this popular cultivar.