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80 to 90 Days to maturity. Raphanus sativus. Sakurajima Mammoth Heirloom Seeds. Cool Season Annual. Known as the “Largest Radish in the World” in Japan, Sakurajima Mammoth radishes can grow as big as 100 pounds! More often though it reaches about 15 pounds and can be harvested when 10 inches in diameter for the best flavor. Despite its size, this variety is sweet, mild, and crisp. Plant this round white variety in early fall and harvest in the winter. Then, use it for cooking and pickling. ~ 1,600 seeds / oz.
Other Common Names:King of Daikons, Japanese radish, daikon radish
How to Grow Sakurajima Mammoth Radishes
In late summer or early fall, sow seeds 1/4" deep in loosened soil with abundant organic matter. Rows should be 12 inches apart. Seedlings should be thinned to 4 inches apart. Avoid planting in the spring as these radishes will not have enough time to mature before they bolt. Keep the soil consistently moist.
Harvesting Daikon Radishes
Smaller Sakurajima radishes should be easy to pull from the soil by hand. Larger ones, or ones grown in compacted soil, will likely need to be dug up with a shovel or gardening fork.
While this variety does not store as well as other daikons, it can still stay fresh in the fridge for several weeks. Remove and use the tops in other dishes.
This radish’s large size would make it a great choice for roasting! They could also be pickled to make a tasty side dish or garnish. Try making kenchinjiru, a Japanese vegetable soup, for a real treat! The leaves could be used in this soup as well, added to a stir-fry, or salad.
Tips From Our Gardeners
"Since this variety can take a long time to mature, I would recommend taking measures against pests. One option I like to use is floating row covers. These will cover your plants and protect them from bugs throughout the season! "
- Katie Robinson, True Leaf Market Writer and Horticulture Student
Loose, fertile soil that is well-draining and moist. Soil should be in the 5.8-6.8 pH range.
Pests and Disease:
Root maggots often cause the most damage to radishes, but cabbage loopers can also damage overall yields. Treat with insecticides as needed. If plants are given too much water, fungal diseases like root rot or powdery mildew can occur.
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