When to plant eggplants in Sion: 28 June – 29 June

In Sion, eggplant: sow for seedlings from 8 April to 30 April; plant into a greenhouse from 7 June to 29 June; plant out into open ground from 28 June to 29 June. For plants and seeds, the places nearby include Ferme Vuissoz (farm shop, 2 km) and Point Vert (garden centre, 5 km); addresses and opening hours are below.

Eggplant in Sion: soil, season and weather

In Sion the soil, not frost, sets the date: the last frost is over around 8 May, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 28 June, 51 days later. 113 days separate planting out (28 June) from the first autumn frost (19 October); the card's 70 days to the first harvest leave 43 for picking, so a start 6 weeks late would still fit.

Last spring frost	8 May
Top 7 cm of soil at 18 °C	28 June, 51 days after the last frost
Into an unheated greenhouse	7 June – 29 June; June outside: 9.5 °C at night, 20.2 °C by day; card 21–29 °C
First autumn frost	19 October, 113 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	6 September – 7 September
Days left for picking	43
Daylight	14:14 on 29 April, 15:46 on 28 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 12 rainy days

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

Eggplant in Sion: care after planting

Planted on 28 June: in the first weeks water every 4 days.

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

28 June — feed: balanced (NPK)
26 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 Sion during the eggplant season

No month of the season averages above the eggplant card's 21–29 °C by day; the warmest, August, averages 22 °C. Months that stay below 21 °C even by day on average: June (20.2 °C), September (17.7 °C) and October (13.7 °C). Nights average below 21 °C in every month of the season, from 2.9 °C to 11.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.2	9.5	125	18	15:46
July	21.8	11.1	115	16	15:27
August	22	10.8	103	14	14:12
September	17.7	7.1	91	12	12:36
October	13.7	2.9	105	12	10:59

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Sion, Neuchâtel is 22 days earlier and Aosta 3 days later.

City	Distance	Date	Difference
Aosta	55 km	1 July – 2 July	3 days later
Lausanne	65 km	19 June – 31 July	9 days earlier
Fribourg	65 km	21 June – 17 July	7 days earlier
Bern	80 km	21 June – 14 July	7 days earlier
Neuchâtel	91 km	6 June – 8 August	22 days earlier
Geneva	94 km	8 June – 28 July	20 days earlier

Where to buy eggplant plants and seeds near Sion

Buy plants ready to set out from 28 June to 29 June (from 7 June to 29 June for an unheated greenhouse); seed for raising your own is sown from 8 April to 30 April. Within 15 km of Sion OpenStreetMap lists 4 garden centres, 1 farm-supply shop, 1 plant nursery, 1 market and 4 farm shops (collected 27 October 2026).

Multiplants — garden centre
Route des Charmilles 42, 1963 Vétroz · 6 km · multiplants.ch
Point Vert — garden centre
Mon–Thu 08:00–18:30; Sat 08:00–17:00; Fri 08:00–20:00 · 5 km
Marché de la vieille ville — market
Fri 08:00–14:00 · 0 km · mvvsion.ch
Ferme Vuissoz — farm shop
Chemin de Maragnène 40, 1950 · 2 km · ferme-vuissoz.ch

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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