Widely praised by gardeners everywhere, 'Stairway to Heaven' Polemonium (Polemonium reptans 'Stairway to Heaven') brings unique beauty to the garden. Commonly called Creeping Jacob's Ladder for its creeping habit and ladder-like foliage, the plant grows in a mound to about a foot high and 18 inches wide and bears sprays of intensely blue flowers in May and June. It likes moist, humusy soil in full sun or dappled shade and makes a wonderful companion to hostas, coral bells, and other shade-loving plants.