Answer: To be honest I can't think of any one plant that would do all those things. Low growing juniper shrubs are probably the least expensive alternative in the long run as each plant will cover a considerable square footage. The ground hugging types will also cascade a bit as they reach the edge, and they are of course evergreens. Unfortunately, they don't flower. Unfortunately, although perennials will bloom they are not for the most part evergreen, and to cover such a large area would require a huge number of plants.
You might try intermixing junipers and some tough perennials such as daylilies, black-eyed Susans, purple cone flowers, and spring bulbs to add the color you want. Good luck with your project!
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