Mammoth Sandwich Island
What's special about Mammoth Sandwich Island
The standard heirloom — 8–10 in tapered white roots with delicate oyster-like flavor. Purple flowers in year two.
Growing this variety
Mammoth Sandwich Island follows the same growing basics as Salsify. Variety-specific maturity above; everything else below applies to the whole Salsify family.
Germination
Spacing & depth
How to plant
Use fresh seed and deeply loosened, stone-free soil like parsnip. Sow early spring; keep moist through the slow germination. Thin to prevent forked roots.
Grower's tip
Slender white roots taste subtly of oysters when simmered. Mulch and leave in the ground through winter — dig as needed.
Soil preferences
Deep, loose, stone-free sandy loam — rocks and clumps fork roots.
6.0–7.0
Avoid fresh manure or heavy nitrogen (causes hairy or forked roots). A light compost and rock phosphate work well.
Watering
Steady moisture — 1 in per week. Uneven watering causes cracking.
Deep soaking; avoid shallow daily watering that keeps roots near the surface.
Overwatered: cracked or rotted roots, foliage disease. Underwatered: woody, hot-flavored, or bitter roots.
Prefers top-watering — Top-water at the base. Wet foliage spreads late blight and early blight; keep leaves as dry as possible.
Temperature tolerance
60–75°F (15–24°C)
45–65°F (7–18°C)
Carrots, parsnips, beets sweeten after frost. Storage roots can often overwinter in the ground under heavy mulch.
Container growing
Possible with the right cultivar
12+ in deep for full-size carrots and parsnips; 8 in deep is fine for radish and short carrots
Pick short or round cultivars (Parisian carrots, Chioggia beets) for shallow containers.
Succession planting
Radish every 2 weeks. Carrots and beets every 3–4 weeks spring through late summer.
Detailed harvesting
Loosen soil with a fork before pulling to prevent snapped tops. Twist off greens 1 in above the crown for storage; leave 1 in of stem on beets to prevent bleeding.
Post-harvest storage & preservation
Trim tops; store unwashed in damp sand or perforated bags in the fridge or root cellar at 32–40°F. Most root crops keep 3–6 months.
Culinary, medicinal & other uses
Fresh, roasted, fermented (kraut, kimchi), pickled. Tops of beets, radishes, and turnips are edible greens.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Biennial and insect-pollinated. Root crops cross widely (carrots cross with Queen Anne's Lace).
1/2 mile in the open or use cage with introduced pollinators.
Overwinter the best roots; replant in spring; collect the dry umbels/seed stalks in year 2.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for salsify in your area. These are regional averages — always check your own last-frost forecast before sowing.
My Mammoth Sandwich Island Salsify notes
Mammoth Sandwich Island Salsify seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
From your kitchen — grow salsify from what you already have
Root crops are usually biennials — the root is year 1, the seed is year 2. Store your best roots over winter, replant in spring.
- 1At harvest, save 5–10 of the best roots and store them cool, damp, and above freezing.
- 2In early spring, replant them tops-up at soil level.
- 3They'll bolt, flower, and set seed heads later that summer.
- 4Cut dry heads into a bag, rub free, sieve, and store cool and dry.
Storage: 3–5 years dry for most root seed.
Order more seeds
Running low? Reorder from one of these seed stores.
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