Mammoth Sandwich Island Salsify Seeds (Tragopogon porrifolius)

Mammoth Sandwich Island Salsify (Tragopogon porrifolius) is a vigorous cool-season plant known for its long, pale roots and tall grassy foliage. This hardy biennial (grown as an annual) thrives in cool climates with loose soil, producing tapered white roots and attractive purple blooms if allowed to mature.

Naturally Non-GMO, Salsify grows well in outdoor garden beds and deep, loose soil. It prefers full sun, consistent moisture, and cool temperatures for best root size. Popular for its unique texture and reliable growth, Mammoth Sandwich Island is a great choice for gardeners seeking a distinctive, easy-growing root variety.

Features

• Vigorous cool-season root crop with long pale roots
• Strong upright leafy growth with tall grassy stems
• Natural, untreated, Non-GMO seed variety
• Grows best in cool climates with deep loose soil
• Suitable for garden beds, rows, and outdoor planting
• Produces large tapered roots and ornamental purple blooms

Specifications

• Seed Type: Natural, untreated, Non-GMO biennial (grown as annual)
• USDA Growing Zones: Best for Zones 5–9
• Sun Requirement: Full sun (6+ hours recommended)
• Best Growing Season: Early Spring or Fall cool-season sowing
• Germination Time: 10–21 days
• Soil Requirement: Deep, loose, well-drained soil with consistent moisture
• Plant Height: 24–36 inches tall if allowed to flower
• Root Maturity Time: Approximately 120–150 days from sowing
• Growth Habit: Upright grassy foliage with deep taproot
• Ideal For: Outdoor garden beds, deep soil planting, cool-climate growing

Planting Guide

• Direct sow outdoors—Salsify does not transplant well
• Plant seeds 1/2–1 inch deep in deep, loose soil
• Keep soil evenly moist during germination and root growth
• Provide full sun for strong foliage and root development
• Thin seedlings to 4–6 inches apart once established
• Avoid compacted soil; loosen soil deeply before planting
• Water regularly but do not leave soil soggy
• Harvest roots after first frost for best texture and size