These seeds are from Thunbergia grandiflora Blue, also known as Bengal Trumpet, Bengal Clock Vine, Blue Trumpet Vine, and Large-flowered Thunbergia. This amazing vine produces ropes of the most beautiful and vibrant flowers you have ever seen. Thunbergia grandiflora Blue can grow up to about 20 feet long and likes to be in the sun to partial shade. The blue, lavender, and white petals are on display from the middle of the Summer until early Fall. USDA Hardiness Zones 8 to 11.