Answer: Lavender can grow between 1'-3' tall, depending upon variety. Since they're woody plants, you can keep them trimmed to about 2' high with annual pinching and pruning. This will give them a compact, mounding appearance, which will be perfect for the edge of the drive. Lavender is a bit more tolerant of heat and shouldn't mind additional heat reflected from your driveway. Daylilies grow can grow considerably taller, especially when flower stems are produced. I'd put them at the back of the bed.
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