Here I am offering a Starter Plant of Passiflora caerulea Waterloo Blue, also known as Blue Passion Flower, and Hardy Passionflower. I love the way these plants look crisp and sharp, and they are also admired by the bees, birds and butterflies. These fragrant vines can grow 40 feet high if they have something that high to climb. This tough little guy can survive down to -10F, which is how it got one of its names, the Hardy Passionflower. Passiflora caerulea is a North American native host plant for the Gulf Fritillary, the Variegated Fritillary, the Zebra Longwing, and the Julia butterflies. USDA Hardiness Zones 6 to 10