Description Giant Allium (Allium giganteum) is the tallest of the large flowering allium with 4"-6" diameter, ball-shaped flowers. The Giant Allium adds a wonderful element to a garden and will even catch the eye of the non-gardeners! These huge flowers blossom the size of softballs with a gorgeous purple color and sway atop sturdy stems in late spring. These add great texture and look great when planted amongst other shorter plants. Click here for a complete guide on planting Allium!  Need a bit more help with Allium? Click here to read our Bulb Blog all about Allium!!