Vegetables Sweet Potatoes Mahon Yam™

Mahon Yam™

Organic Sweet Potato Slips

Product ID: 3200G

Certified organic with sweet flavor and no strings.

A unique sweet potato with pink skin and sweet orange flesh that has slightly drier texture than Beauregard. A clear favorite in Johnny's taste tests. Very good yields of uniform, cylindrical roots - even in Northern climates - with the potential to outperform Beauregard. Excellent storage potential when cured properly. Developed and maintained over 20 years by organic grower John Mahon. Despite the name, this variety is a sweet potato, not a yam. Plant Patent #20,666. Organically grown.



100 Units

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500 Units

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1,000 Units

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Additional Information

  • This product does not ship outside the United States.
  • This product does not ship to the following states: CA,  MS,  AA,  AE,  AP,  AS,  FM,  GU,  MH,  MP,  VI,  PW,  PR.
Organic Sweet Potato slips ship weekly from late April through early June, starting in the southern US. Add item to cart and enter your shipping zip code to select from a list of available ship dates for your plant hardiness zone. If you wish to choose a ship date earlier than the recommended dates, you must place your order by phone (1-877-564-6697). Physical address required for delivery (no PO Boxes).
You will receive bare-root "slips." Expect them to be wilted, dry, or pale in color from shipping. This is normal. Slips are very hardy and will still grow. If planting must be delayed by a few days, wrap the root end of the slips in moist paper towels, keeping the leaves and stems dry. Place upright and keep at room temperature, out of direct sunlight and wind. If planting must be delayed by a week or more, loosely plant the slips in sterile potting soil and keep soil moist; keep indoors or in a greenhouse. Gently lift out and separate slips when ready to plant.
CULTURE: Sweet Potatoes grow best in well-drained, sandy loam soil with a pH of about 6.5. You will receive bare-root slips. It is normal for them to be wilted, dry, or pale in color from shipping. If planting must be delayed, wrap the root end of the slips in moist paper towels, keeping the leaves and stems dry. Place upright and keep at room temp., out of direct sunlight and wind. Plant out as soon as danger of frost has passed, and soil temp. is at least 60°F (16°C). In cold regions, black plastic mulch may help to warm the soil and is recommended. Plant slips 3-4" deep in raised beds 10-18" apart in rows 36-60" apart. Keep well irrigated until plants are established.
DISEASES: Avoid diseases such as scurf with crop rotation and by removing all plant debris after harvest.
INSECT PESTS: Sweet potatoes are usually free from major insect infestations, but problems may arise from flea beetles, Japanese beetles, wireworms, and sweet potato weevils (in southern U.S.)
HARVEST: Dig roots in fall before hard frost and before soil temps. drop to 50°F (10°C). If plants get frosted, harvest as soon as possible - frost damage will travel from the plants down into the roots, and affect storage quality.
STORAGE: Brush soil from roots and cure in a warm (85°F/29°C), dark, well-ventilated place for 4-7 days to toughen skin. Store at 60° (16°C), in a dark, humid place and avoid unnecessary handling.

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Quick Facts

Latin Name
Ipomoea batatas
Days To Maturity
Average number of days from seeding date until ready for harvest.
90 Days
Life Cycle
Plants can be Annuals (single growing season), Perennials (grow year after year), Tender Perennials (grow year after year in warmer climates; and in some cases when given special protection in colder climates), or Biennials (require two years to mature).
Product Features
Johnny's Exclusive Johnny's Exclusive
Organic Seeds, Plants, and Supplies Organic Seeds, Plants, and Supplies
Plants, or seeds harvested from plants, that have been grown without synthetic fertilizers or pesticides, strictly adhering to the USDA's National Organic Standards Board (NOSB) organic gardening practices are designated as Organic.

Supplies that meet the USDA's National Organic Program (NOP) rules according to a third-party authority such as OMRI, WSDA, and/or a local authority such as MOFGA or NOFA.
Johnny's Exclusive Organic Seeds, Plants, and Supplies