Which plant is often associated with ornamental borders and is known for its vibrant colors?

The plant most often associated with ornamental borders and known for its vibrant colors is the pansy. Pansies (Viola tricolor var. hortensis) are valued in gardens for their wide variety of bright and attractive colors, as well as for their ability to thrive in different climates, particularly in cooler temperatures. They are commonly used in ornamental borders because of their capacity to produce lush blooms for an extended period, adding visual interest and color to garden spaces.

In contrast, while peonies (Paeonia) are celebrated for their large, showy flowers, they are generally perennial and may not be as effective in providing ongoing color in borders compared to annuals or shorter-lived plants like pansies. Leucanthemum, or daisies, tend to have a more subdued color palette and are often used in more naturalistic or cottage garden settings rather than formal borders. Marigolds are indeed colorful and used in borders, but they are more associated with summer annual displays rather than the broader ornamental use associated with pansies. Thus, the vibrant, diverse colors and adaptability of pansies make them the ideal choice for ornamental borders.