Mitoyo Eggplant

Solanum melongena (nightshade)

Also known as: Mitoyo Japanese Eggplant

A Japanese heirloom from the Mitoyo and Kanonji regions of Shikoku Island — widely regarded as one of the best-tasting eggplants ever grown. Large glossy near-black fruit, up to 450g each, teardrop to oval in shape. The white flesh is so tender, creamy, and sweet it can be eaten raw. Soft edible skin. Excellent baked, roasted, pickled, grilled, or in traditional Japanese preparations like nasu dengaku and tempura. Ornamental plants earn their place in the garden with green leaves that push purple as they emerge.

Days to harvest 75-90 days
Fruit size Up to 450g, teardrop to oval
Sowing depth 6mm
Germination 7–21 days at 24–32 °C
Spacing 60cm apart in rows 80cm apart
Aspect Full sun, moist well-drained soil
Frost tolerance Frost sensitive — needs reliably warm nights

Growing notes

Choose a full-sun spot with shelter from cold winds. Mitoyo grows tall at 90–120cm and carries heavy fruit — staking from planting is essential. If growing in a pot needs a large pot 40L+ and staking.

Soil preparation: Amend soil with aged compost or well-rotted manure to ensure fertility and drainage; maintain a pH between 5.5 and 6.8.

Support: Install sturdy stakes at planting time. The tall growth combined with heavy fruit can pull unstaked plants over quickly.

Watering & feeding: Water deeply to keep soil evenly moist but not soggy; feed with a balanced fertiliser every 2–3 weeks during the growing season. Consistent watering is key to Mitoyo's signature sweetness — dry spells cause bitterness.

Harvest: Pick when fruit is glossy, firm, and full-sized. Best flavour is at peak ripeness — Mitoyo is unusual in that it can be harvested young or at full size without turning bitter. Cut with secateurs leaving a short stem attached.

Timing: Expect first harvest 75–90 days after transplanting. Regular picking encourages continued production.

Key features

  • Open-pollinated Japanese heirloom
  • Reputed one of the best-tasting eggplants
  • Large glossy near-black fruit up to 450g
  • Sweet, creamy flesh — tender enough to eat raw
  • Soft edible skin — no need to peel
  • Ornamental foliage — green with purple new growth

Short season tips

Best started indoors on heat mats — eggplants need 24–32 °C heat to germinate. Sow 6–8 weeks before the last frost or purchase as 6–8-week-old seedlings. Transplant into the garden when soil temperature has reliably warmed to at least 15°C (ideally 18°C or above) to avoid plant stalling. Mitoyo's long maturity window and preference for consistent warmth mean inland NSW growers should sow indoors as early as conditions allow, and keep young plants under cover through variable spring weather.

  • Spring
  • Summer

Perennial in frost-free areas; grown as an annual elsewhere

  • Marigolds Beans Nasturtiums
  • Other nightshades (tomatoes, potatoes, capsicums)

A traditional Japanese heirloom from the Mitoyo and Kanonji regions of Shikoku Island, where it has been grown for generations and remains a local specialty. The Japanese culinary tradition of raw and lightly-cooked vegetables suits Mitoyo's exceptionally tender, sweet flesh — the variety was selected for exactly the eating style it complements. Widely considered one of the finest-tasting eggplants ever brought into cultivation.