Seeds Scarlet Gilia, Skyrocket, Scarlet Trumpet Flower, Sky Trumpet Growing 36-48 inches in zones 4-11, this is a plant for everyone. The lovely 1 inch blossoms range from dark pink to creamy tan. It is said that Indians valued this plant because they used it to make a tea to treat children’s colds, blood troubles, to make glue and a blue dye from the roots.