Seeds from this very hard to find Aristolochia baetica or Portugese Hardy Dutchman’s Pipe Hardy i zones: 5-9 A woody-based, twining vine with small heart-shaped, pointed, gray-green leaves, abundant tubular purple funnel-shaped flowers. Prefers well-drained soil and grows to 8 feet. Produces lots of these wonderful velvety purple pipe shaped blossoms in June and July.