Kaho watermelon in a wood box with surrounding melons, melon slices, and melon balls in a white dish.
A whole Kaho Watermelon surrounded by slices and watermelon juice.
A whole Kaho Watermelon surrounded by slices, melon balls and watermelon juice.
Kaho watermelon in a wood box with surrounding melons, melon slices, and melon balls in a white dish.
A whole Kaho Watermelon surrounded by slices and watermelon juice.
A whole Kaho Watermelon surrounded by slices, melon balls and watermelon juice.

Watermelon Seeds,
Kaho

4.222 ReviewsSKU: #WM214Min. seed count: 15
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Description

(Citrullus lanatus). Our favorite mini melon! This is one of the best finds from our trip to Japan. The Kaho watermelon has gorgeous salmon orange flesh that is delicious right up to the super thin rind, making this one of the most unique watermelons we have trialled. It was also one of the best we've tasted. Elongated fruit weighs about 2 to 4 pounds and is perfect for two servings. This rare heirloom was originally brought to Japan from China around the year 1912.

Growing Tips: Kaho watermelon grows best in full sun with fertile, well-drained soil. Because of its smaller size and shorter vines, it is suitable for tighter garden spaces or container growing. Water deeply and consistently, and mulch around the base of plants to preserve moisture and regulate soil temperature.

Plant Details

Botanical Name
Citrullus lanatus
Life Cycle
Annual
Growth Habit
Vining
Sun Requirement
Full sun
Days to Germinate
5–10
Days to Maturity
70–80
Planting Depth
1 in.
Plant Spacing
36–48 in.
Ideal Temperature
70–95°F
Frost Hardy
No

When to Grow

Start seeds indoors 2–4 weeks before your region’s last frost date or direct sow outdoors once soil reaches 70°F. Only transplant after all risk of frost has passed and temperatures are steadily warm. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow 2–3 seeds per hill, 1 inch deep. Thin to the healthiest seedling after germination. Space plants 2–3 feet apart in rows spaced 4–5 feet apart. Select a location with good air circulation and excellent drainage. Amend soil with compost or aged manure prior to planting.

How to Grow

Water regularly, providing 1–2 inches of water per week. Cut back slightly once fruits begin to ripen to concentrate sugars. Fertilize with a balanced organic fertilizer when vines begin to run. Due to compact vines, Kaho may benefit from vertical training or trellising to conserve space and improve airflow.

How to Save Seeds

  • Choose fully ripe or overripe fruits from healthy, true-to-type plants.
  • Scoop seeds from the flesh and rinse in a strainer to remove pulp.
  • Spread seeds on a screen or paper towel in a warm, dry place out of direct sunlight for 7-10 days.
  • Stir daily to ensure even drying.
  • Once completely dry, store in an labeled, airtight container in a cool, dark place.

FAQ

Is Kaho watermelon a hybrid or heirloom?

Kaho is a traditional Japanese heirloom, open-pollinated variety, not a hybrid. It is suitable for seed saving and will grow true to type when isolated from other watermelon varieties.

How big do Kaho watermelons get?

Kaho produces small, elongated melons typically weighing 2 to 4 pounds—perfect for individual servings or small households seeking gourmet flavor in a manageable size.

Can I grow Kaho watermelon in containers?

Yes, Kaho’s compact vines and modest fruit size make it well-suited for container growing. Use a large, well-drained pot with full sun exposure and support vines as needed.

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