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When to plant hyacinths in Karlsruhe: 20 October – end of December

In Karlsruhe, hyacinth: plant from 20 October to the end of December. For planting stock, the places nearby include Garten- und Landschaftspflege Mohrhardt (farm shop, 7 km) and Hofladen Gebrüder Kless (farm shop, 8 km); addresses and opening hours are below.

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 Karlsruhe: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 0.2 °C.

Planting20 October – end of December
First autumn frost19 November
Coldest nightsJanuary, 0.2 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:35 on 20 October
Daylight at the winter solstice8:13

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

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

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS).

In Karlsruhe the average daily temperature stays at 10 °C or lower for about 23 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 Karlsruhe, Stuttgart is 11 days earlier and Wiesbaden 4 days later.

CityDistanceDateDifference
Stuttgart62 km9 October – end of December11 days earlier
Strasbourg68 km21 October – end of December1 day later
Wiesbaden120 km24 October – end of December4 days later
Frankfurt124 km18 October – end of December2 days earlier
Mulhouse161 km18 October – end of December2 days earlier
Metz162 km18 October – end of December2 days earlier

Where to buy hyacinth for planting in Karlsruhe

Planting stock goes into the ground from 20 October to the end of December; buy it before that. Within 15 km of Karlsruhe OpenStreetMap lists 25 garden centres, 3 farm-supply shops, 18 plant nurseries, 23 markets and 59 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Karlsruhe?

In Karlsruhe, hyacinth: plant from 20 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 Karlsruhe?

Last spring frost around 5 April, first autumn frost around 19 November.

Other crops in Karlsruhe, with their dates