When to plant eggplants in Bonn: 4 June – 30 July

In Bonn, eggplant: sow for seedlings from 15 March to 31 May; plant into a greenhouse from 14 May to 30 July; plant out into open ground from 4 June to 30 July. For plants and seeds, the places nearby include Bio-Weihnachtsbäume Udo Dorant (plant nursery, 7 km) and Blumenhaus Rieck (garden centre, 8 km); addresses and opening hours are below.

Eggplant in Bonn: soil, season and weather

In Bonn the soil, not frost, sets the date: the last frost is over around 8 April, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 4 June, 57 days later.

Last spring frost	8 April
Top 7 cm of soil at 18 °C	4 June, 57 days after the last frost
Into an unheated greenhouse	14 May – 30 July; May outside: 8.9 °C at night, 19 °C by day; card 21–29 °C
First autumn frost	19 November, 168 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	13 August – 8 October
Days left for picking	98
Daylight	13:09 on 5 April, 16:16 on 4 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 12 rainy days

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

Eggplant in Bonn: care after planting

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

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

4 June — feed: balanced (NPK)
2 July — 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 Bonn during the eggplant season

No month of the season averages above the eggplant card's 21–29 °C by day; the warmest, August, averages 24.8 °C. Months that stay below 21 °C even by day on average: October (15.9 °C) and November (10.1 °C). Nights average below 21 °C in every month of the season, from 4.3 °C to 14.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.6	13.6	76	12	16:28
July	24.3	14.6	83	13	16:05
August	24.8	14.9	64	12	14:35
September	21	11.8	77	10	12:41
October	15.9	8.9	70	14	10:48
November	10.1	4.3	73	15	9:00

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Bonn, Cologne is 1 day earlier and Dortmund 1 day later.

City	Distance	Date	Difference
Cologne	25 km	3 June – 31 July	1 day earlier
Düsseldorf	60 km	3 June – 1 August	1 day earlier
Duisburg	81 km	3 June – 2 August	1 day earlier
Essen	81 km	3 June – 1 August	1 day earlier
Bochum	84 km	3 June – 31 July	1 day earlier
Dortmund	90 km	5 June – 27 July	1 day later

Where to buy eggplant plants and seeds near Bonn

Buy plants ready to set out from 4 June to 30 July (from 14 May to 30 July for an unheated greenhouse); seed for raising your own is sown from 15 March to 31 May. Within 15 km of Bonn OpenStreetMap lists 32 garden centres, 4 farm-supply shops, 3 plant nurseries, 9 markets and 50 farm shops (collected 28 October 2026).

Blumenhaus Rieck — garden centre
Gringsstraße 13, 53177 Bonn · 24/7 · 8 km
Die Grüne Halle — garden centre
Spicher Straße 50, 53844 Troisdorf · Mon–Sat 10:00–18:00 · 9 km
Bauhaus Gartencenter — garden centre
Mon–Sat 08:00–20:00 · 13 km · bauhaus.info
Bio-Weihnachtsbäume Udo Dorant — plant nursery
Dec 4–23 Mon–Sun 10:00–17:00 · 7 km · biobaumalfter.de

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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