Sabrina-- I have great variations in scape height. I find some are shorter and some are taller. I live Texas and experience extreme temperature variations. Even in my yard it varies. Majestic Hue on one side of the yard bloomed at 36 to 38 inches and on the other side it bloomed 26 to 28 inches. Neither was its 30 inches. I have good soil, my homemade soil mixtures, and filtered shade usually plants grow bigger for me. But if sun or temperature variations bother them they can be smaller. Just keep checking heights on your daylilies and you will get a feel for what they will do. (Larger, smaller or right on the money) Many daylilies take 3 years to mature and be consistent. But my Majestic Hue is 3. Joy to you!