Answer: Sedums (Stonecrop) are often planted in rock gardens. These are succulent perennials You are describing Sedum kamtschaticum or Sedum morganianum (Donkey Tail or Burro Tail). Both plants have thick, fleshy leaves that overlap, making the stems look like they're braided. Both produce start shaped yellow flowers. Maybe the names will help you find pictures of the plants so you can figure out which one you're trying to identify.
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