Dragon Arum (Dracunculus vulgaris) in Zone 5: Not Hardy, Slow Growth

A zone 5 gardener planted dragon arum in spring; by September it's only 2 inches tall. Asks if perennial and why so small.

Hardiness

Dragon arum is hardy to zone 6-9. In zone 5, it will not survive winter in ground.

Why So Small?

• First-year plants often focus on root/tuber development.
• Cool spring/insufficient heat units.
• Needs rich, moist, well-drained soil and full sun to part shade.

Options

1. Lift tuber in fall after frost kills foliage. Store dry at 40-50°F. Replant spring.
2. Grow in large pot and move to protected garage for winter.
3. Accept as annual—buy new each year.

Sources for Info

Van Dyck's, Van Bourgondien, McClure & Zimmerman, Dutch Gardens (search "unusual" or "rare" plants).