39. Giant Allium
If you’re looking for a showstopper with surprisingly long-lasting flowers, look no further than the Giant Allium. As the Allium part of its name suggests, it is indeed related to garlic, onion, and other members of the Allium family and its flowers show that relationship.
It emerges early in spring and quickly fills in its growing area with vibrant green leaves reminiscent of tulip greens. The flowers last up to several weeks, depending on weather, and are incredibly eye-catching. In the beginning of summer it rewards gardeners with huge globes covered in small purple flowers at the top of long, thick stems.