When to plant garlic in Sion: 19 September – 19 November

In Sion, garlic: plant from 19 September to about 19 November. For planting stock, the places nearby include Point Vert (garden centre, 5 km) and Multiplants (garden centre, 6 km); addresses and opening hours are below.

Garlic is best planted early in the window: cloves planted late make smaller bulbs. Late planting works only while the soil is not frozen. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: UVM Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Garlic in Sion: soil, season and weather

Garlic goes into the ground in Sion from 19 September to about 19 November; the window opens a month before the first autumn frost. Nights then average below 0 °C in November–April; the coldest, January, averages -7.3 °C.

Planting	19 September – 19 November
First autumn frost	19 October
Coldest nights	January, -7.3 °C
Soil back at 5 °C in spring	5 April
Harvest (card)	about 8 months after planting: May
Daylight	12:23 on 19 September
Daylight at the winter solstice	8:37

The same dates in Sion hold for Tulip, Daffodil, Crocus and Hyacinth.

Garlic in Sion: care after planting

Planted on 19 September: in the first weeks water every 7 days.

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

19 September — feed: nitrogen
17 October — feed: nitrogen

Pests and diseases of garlic to watch for:

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

Garlic in nearby cities

Around Sion, Aosta is 39 days earlier and Neuchâtel 40 days later.

City	Distance	Date	Difference
Aosta	55 km	11 August – 22 October	39 days earlier
Lausanne	65 km	21 October – end of December	32 days later
Fribourg	65 km	7 October – 30 December	18 days later
Bern	80 km	4 October – 21 December	15 days later
Neuchâtel	91 km	29 October – end of December	40 days later
Geneva	94 km	18 October – end of December	29 days later

Where to buy garlic for planting in Sion

Planting stock goes into the ground from 19 September to about 19 November; buy it before that. 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).

Lehmann Plantes — plant nursery
3 km · lehmannplantes.ch
Agrol — garden centre
Route de Sion 90, 3960 Sierre · Mon–Thu 08:00–18:30; Fri 08:00–20:00; Sat 08:00–17:00 · 13 km · agrol.ch
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

Questions