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When to plant hyacinths in Hiroshima: 26 October – end of December

In Hiroshima, hyacinth: plant from 26 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 Hiroshima: soil, season and weather

Nights then average below 0 °C in January, February; the coldest, January, averages -1.8 °C.

Planting26 October – end of December
First autumn frost25 November
Coldest nightsJanuary, -1.8 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:59 on 26 October
Daylight at the winter solstice9:51

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

Hyacinth in Hiroshima: 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 Hiroshima 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

Around Hiroshima, Ulsan is 9 days earlier and Fukuoka 26 days later.

CityDistanceDateDifference
Okayama138 km15 November – end of December20 days later
Fukuoka209 kmby 21 November26 days later
Kumamoto239 kmby 3 November8 days later
Osaka281 km17 November – end of December22 days later
Kyoto311 km7 November – end of December12 days later
Ulsan313 km17 October – end of December9 days earlier

Where to buy hyacinth for planting in Hiroshima

Planting stock goes into the ground from 26 October to the end of December; buy it before that. Within 15 km of Hiroshima OpenStreetMap lists 2 garden centres, 2 farm-supply shops, 3 markets and 2 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Hiroshima?

In Hiroshima, hyacinth: plant from 26 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 Hiroshima?

Last spring frost around 9 April, first autumn frost around 25 November.

Other crops in Hiroshima, with their dates