When to plant eggplants in Kumamoto: 2 May – 13 August

In Kumamoto, eggplant: sow for seedlings from 10 February to 14 June; plant into a greenhouse from 11 April to 13 August; plant out into open ground from 2 May to 13 August. For plants and seeds, the places nearby include 合志物産館志来菜彩 (farm shop, 11 km); addresses and opening hours are below.

Eggplant in Kumamoto: soil, season and weather

In Kumamoto the soil, not frost, sets the date: the last frost is over around 18 March, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 2 May, 45 days later.

Last spring frost	18 March
Top 7 cm of soil at 18 °C	2 May, 45 days after the last frost
Into an unheated greenhouse	11 April – 13 August; April outside: 10.4 °C at night, 20.6 °C by day; card 21–29 °C
First autumn frost	3 December, 215 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	11 July – 22 October
Days left for picking	145
Daylight	11:32 on 3 March, 13:30 on 2 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 9 rainy days

The same dates in Kumamoto hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Kumamoto: care after planting

Planted on 2 May: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

2 May — feed: balanced (NPK)
30 May — feed: nitrogen

Pests and diseases of eggplant to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Kumamoto during the eggplant season

Days average above the eggplant card's 21–29 °C in July (30.8 °C), August (32.3 °C) and September (29.4 °C). Months that stay below 21 °C even by day on average: November (18.5 °C) and December (12.4 °C). Nights average below 21 °C in May, June and October–December (2.9–19.3 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	24.3	14.6	255	14	13:50
June	27.2	19.3	442	18	14:18
July	30.8	23.4	381	19	14:07
August	32.3	23.8	258	17	13:23
September	29.4	21.1	205	17	12:24
October	24.4	14.8	112	11	11:24
November	18.5	8.3	89	9	10:29
December	12.4	2.9	70	9	10:00

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

All the nearest cities on our list plant eggplant later than Kumamoto; the closest date is in Fukuoka, 3 days later.

City	Distance	Date	Difference
Fukuoka	92 km	5 May – 31 August	3 days later
Kitakyushu	121 km	from 15 May	13 days later
Kagoshima	134 km	6 May – 5 September	4 days later
Hiroshima	239 km	26 May – 5 August	24 days later
Busan	305 km	15 May – 2 August	13 days later
Ulsan	331 km	18 May – 27 July	16 days later

Where to buy eggplant plants and seeds near Kumamoto

Buy plants ready to set out from 2 May to 13 August (from 11 April to 13 August for an unheated greenhouse); seed for raising your own is sown from 10 February to 14 June. Within 15 km of Kumamoto OpenStreetMap lists 3 garden centres, 5 markets and 2 farm shops (collected 28 October 2026).

植木青果市場 — market
08:30–22:00; Tue, Sat, public holidays -1 day closed · 13 km
合志物産館志来菜彩 — farm shop
09:00–19:00 · 11 km
タケウチガーデンギャラリー — garden centre
6 km
サンコーペットグリーン — garden centre
2 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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