The plants have an upright and sturdy growth habit, reaching up to 2' tall with a ". Habit: Eryngium x zabelii 'Neptune's Gold' grows to be an clump forming perennial with flower stems above the foliage. The spiny bracts can sport varying gradients of chartreuse and blue. Golden leaves contrast nicely with steel blue stems and deep periwinkle blue flowers. Imagine this in an eryngium, "the spiky bracts are silvery blue at the base, turning gold at the tips. The stems of 'Neptune's Gold' are blue, and the foliage. A new and totally unique introduction of Sea Holly - the foliage of this Eryngium is a brilliant golden colour, it will become lime green if slightly shady. . About this cultivar: ; Habit · Clump forming, bushy ; Foliage: Deciduous ; Height: 60 - 90 cm (2 - 3 ft) ; Spread: 45 - 75 cm ( - ft) ; Time to full growth: 2. Height: up to 40 - 60 cm (2 ft); Spread. A stunning. Eryngium zabelii 'Neptune's Gold' is a versatile perennial that produces large spiky steely-blue flowers that rise above the spiny foliage in summer. The bracts show colors from gold to silver to lavender to blue.