Here's a quick visual comparison of 2 cucumber plants, Palace Kings, that were planted at the same time. One in a hugelhole, a hole dug about 1.5' deep and wide and then layered up with horizontal branches. The other in just regular garden soil. Pictures taken today.
Palace King in a hugelhole. ~3.5' tall with baby cukes.
Palace King in regular garden, clay, soil. ~2' tall with blossoms only.