When to plant eggplants in Okayama: 14 May – 25 August

In Okayama, eggplant: sow for seedlings from 22 February to 26 June; plant into a greenhouse from 23 April to 25 August; plant out into open ground from 14 May to 25 August.

Eggplant in Okayama: soil, season and weather

In Okayama the soil, not frost, sets the date: the last frost is over around 20 March, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 14 May, 55 days later.

Last spring frost	20 March
Top 7 cm of soil at 18 °C	14 May, 55 days after the last frost
Into an unheated greenhouse	23 April – 25 August; April outside: 9 °C at night, 19.1 °C by day; card 21–29 °C
First autumn frost	15 December, 215 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	23 July – 3 November
Days left for picking	145
Daylight	11:56 on 15 March, 13:56 on 14 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 5 rainy days

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

Eggplant in Okayama: care after planting

Planted on 14 May: in the first weeks water every 4 days.

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

14 May — feed: balanced (NPK)
11 June — 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 Okayama during the eggplant season

Days average above the eggplant card's 21–29 °C in July (30.5 °C) and August (32.4 °C). Months that stay below 21 °C even by day on average: November (16.7 °C) and December (10.8 °C). Nights average below 21 °C in May, June and September–December (2.3–20.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.4	13.6	133	10	13:58
June	26.7	18.3	208	14	14:28
July	30.5	23.1	230	15	14:16
August	32.4	24.2	162	13	13:29
September	28.3	20.8	193	14	12:26
October	22.4	14.2	115	10	11:21
November	16.7	7.7	54	6	10:22
December	10.8	2.3	37	5	9:51

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Okayama, Osaka is 9 days earlier and Hiroshima 12 days later.

City	Distance	Date	Difference
Hiroshima	138 km	26 May – 5 August	12 days later
Osaka	145 km	5 May – 27 August	9 days earlier
Kyoto	174 km	14 May – 17 August	same day
Nagoya	278 km	6 May – 20 August	8 days earlier
Kitakyushu	292 km	from 15 May	1 day later
Fukuoka	345 km	5 May – 31 August	9 days earlier

Where to buy eggplant plants and seeds near Okayama

Buy plants ready to set out from 14 May to 25 August (from 23 April to 25 August for an unheated greenhouse); seed for raising your own is sown from 22 February to 26 June. Within 15 km of Okayama OpenStreetMap lists 8 garden centres, 5 farm-supply shops, 3 markets and 19 farm shops (collected 28 October 2026).

吉田種苗園 — garden centre
2 km
西大寺ガーデン — garden centre
9 km
福島農機株式会社 — farm supply
14 km · fukushima-nouki.com
JA岡山西大寺資材店 — farm supply
10 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.

Questions