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

In Karlsruhe, crocus: plant from 20 October to the end of December. For planting stock, the places nearby include Raiffeisenmarkt Grötzingen (farm supply, 7 km) and Weingärtner´s Garten- und Landhandel (farm supply, 11 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.

Crocus 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 Hyacinth.

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

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (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 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus 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 crocus 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 crocuses in Karlsruhe?

In Karlsruhe, crocus: 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