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When to plant hyacinths in Mulhouse: 18 October – end of December

In Mulhouse, hyacinth: plant from 18 October to the end of December.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The average daily temperature here stays above 0 °C all winter, and at least three months average 7 °C or less: our rule of thumb for the winter cold spring bulbs need. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS.

Hyacinth in Mulhouse: soil, season and weather

Nights then average below 0 °C in January; the coldest, January, averages -0.4 °C.

Planting18 October – end of December
First autumn frost17 November
Coldest nightsJanuary, -0.4 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:45 on 18 October
Daylight at the winter solstice8:24

The same dates in Mulhouse hold for Garlic, Tulip, Daffodil and Crocus.

Hyacinth in Mulhouse: depth, winter cold, pests and pets

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS). In the ground hyacinths are fully hardy, but in containers they can be frost tender in cold winters (RHS); here winter nights average below 0 °C, so wrap the pots or move them to a sheltered spot.

In Mulhouse the average daily temperature stays at 10 °C or lower for about 24 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 12–15 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Flowers get smaller in the years after planting: for full spikes, replace the bulbs or add a few new ones each autumn (RHS).

If squirrels are a problem, protect the bulbs with wire mesh (RHS). Hyacinths are toxic to dogs, cats and horses: intense vomiting and diarrhoea (ASPCA).

Sources: RHS, Wisconsin Horticulture Extension, ASPCA.

Hyacinth in nearby cities

Around Mulhouse, Lucerne is 28 days earlier and Neuchâtel 11 days later.

CityDistanceDateDifference
Bern89 km4 October – 21 December14 days earlier
Neuchâtel90 km29 October – end of December11 days later
Strasbourg96 km21 October – end of December3 days later
Zurich100 km17 October – end of December1 day earlier
Fribourg107 km7 October – 30 December11 days earlier
Lucerne107 km20 September – 29 November28 days earlier

Where to buy hyacinth for planting in Mulhouse

Planting stock goes into the ground from 18 October to the end of December; buy it before that. Within 15 km of Mulhouse OpenStreetMap lists 12 garden centres, 2 markets and 7 farm shops (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Mulhouse?

In Mulhouse, hyacinth: plant from 18 October to the end of December. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Mulhouse?

Last spring frost around 6 April, first autumn frost around 17 November.

Other crops in Mulhouse, with their dates