- Name: Mammoth Sandwich Island Salsify - Other Common Names: Vegetable Oyster - Scientific Name: Tragopogon - Color: White - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Harvest: 120 Days - Plant Height: 24 - 36" - Plant Spacing: 12 - 15" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 50 Seeds - Other: The 8 - 9” Tapered Roots Of Salsify Have A Flavor Similar To Oysters Earning Them Their Nickname. This Variety Will Over Winter, And Has The Most Lovely Flowers!