All Blue Potato is a stunning heirloom variety that transforms the humble potato into something worthy of a garden display. With its distinctive blue-purple skin and matching flesh throughout, this cultivar produces small to medium tubers over 80-90 days in zones 3-10. The solid, creamy texture and mild flavor make it equally at home on the dinner table as it is turning heads in a harvest basket. Plant in full sun with moderate water and slightly acidic soil (pH 5.0-6.0), spacing tubers 12 inches apart for reliable yields.
Full Sun
Moderate
3-10
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High
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The true magic of All Blue lies in its jewel-toned flesh that runs through the entire tuber, not just the skin. You'll find the color is more authentically purple than blue, creating a genuinely striking contrast when sliced or diced. Its creamy texture and dependable flavor make it a real showstopper for baked potatoes, boiled preparations, and especially for creating visually dramatic meals. The flesh holds its color beautifully through cooking, making it an unforgettable addition to any potato salad, particularly alongside red and golden varieties for a patriotic presentation.
All Blue excels in any preparation that benefits from its striking appearance and creamy texture. Baking and boiling are the traditional applications where its firm, waxy flesh truly shines. The purple flesh holds its color beautifully through cooking, making it especially prized for potato salads where it creates a memorable visual presentation. Many gardeners specifically grow All Blue alongside Adirondack Red and Keuka Gold varieties to create the dramatic red, white, and blue potato combinations that have become a gardener's signature dish.
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Plant seed potatoes directly in the garden rather than starting indoors. Wait until all frost danger has passed and soil has warmed to at least 50°F. Space seed pieces 12 inches apart in rows, covering with soil.
All Blue is grown from seed potatoes, not true seeds. Plant whole small seed potatoes or cut larger ones into pieces with at least one eye each. Insert them 4-6 inches deep into prepared soil and cover fully. Plant in spring after the last frost date.
All Blue potatoes are ready to harvest 80-90 days after planting, typically when the aboveground foliage begins to yellow and die back. Gently dig around plants to check tuber size, looking for potatoes that have reached your preferred dimensions. Once the leafy tops have fully died back, dig carefully to avoid bruising the thin-skinned tubers. Handle the distinctively colored potatoes gently during harvest and allow them to cure in a cool, dark place before storage.
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“All Blue is known by the alternative name 'Purple Marker' and carries the weight of true heirloom status. This variety represents generations of seed saving and cultivation, though the specific origin story and lineage details are not documented in available records. What we know is that it has survived and thrived in home gardens across North America, particularly in regions like the Hudson Valley, where it remains a beloved seasonal crop. Its persistence in cultivation speaks to the genuine satisfaction it brings gardeners who've chosen to preserve this distinctive cultivar across decades.”