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When to plant hyacinths in Gangneung: 22 October – end of December

In Gangneung, hyacinth: plant from 22 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 Gangneung: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -3.1 °C.

Planting22 October – end of December
First autumn frost21 November
Coldest nightsJanuary, -3.1 °C
Soil back at 1 °C in springalready in the first week of January
Daylight11:00 on 22 October
Daylight at the winter solstice9:33

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

Hyacinth in Gangneung: 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 Gangneung the average daily temperature stays at 10 °C or lower for about 20 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

1 of the nearest cities share Gangneung's date.

CityDistanceDateDifference
Chuncheon103 km1 October – 22 November21 days earlier
Seoul169 km7 October – 26 November15 days earlier
Daejeon205 km13 October – 5 December9 days earlier
Daegu211 km22 October – end of Decembersame day
Ulsan248 km17 October – end of December5 days earlier
Jeonju265 km18 October – 17 December4 days earlier

Questions

When to plant hyacinths in Gangneung?

In Gangneung, hyacinth: plant from 22 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 Gangneung?

Last spring frost around 19 March, first autumn frost around 21 November.

Other crops in Gangneung, with their dates