10+ Seeds of Datura Metel -Devil's Trumpet. Large Double Purple Trumpet Like Flowers Fully double, frilly, lavender-purple trumpet like blooms - Stunningly beautiful garden Datura In addition to the flowers, even the leaves and stems have a hint of purple to them Prefers full sun/partial shade growing rapidly and flowering in the same season. Plants grow 4-5 feet tall and the blooms attract butterflies and hummingbirds. Please soak seeds for 24 hours in lukewarm water prior to planting. It will take 2-3 weeks for germination.