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When to plant crocuses in Blenheim: by 1 May

In Blenheim, crocus: plant by 1 May. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include Golden Mile Produce (farm shop, 6 km); addresses and opening hours are below.

Crocus in Blenheim: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in July, average 5.3 °C.

Plantingby 1 May
First autumn frost31 May
Coldest nightsJuly, 5.3 °C
Soil back at 1 °C in springalready in the first week of July
Daylight10:20 on 1 May
Daylight at the winter solstice9:10

The same dates in Blenheim hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Blenheim: 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 Blenheim the average daily temperature stays at 10 °C or lower for about 11 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. That is less than the bulbs need, and without more cold they may not flower properly. The cold can also be given in a refrigerator at about 2–7 °C, as Wisconsin Horticulture Extension does for crocuses forced in pots.

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 Blenheim, Dunedin is 9 days earlier and Nelson 21 days later.

CityDistanceDateDifference
Nelson63 kmby 22 May21 days later
Palmerston North189 kmby 22 May21 days later
Christchurch249 kmby 6 May5 days later
Timaru389 kmby 5 May4 days later
Rotorua423 kmby 26 April5 days earlier
Dunedin559 km22 April – end of June9 days earlier

Where to buy crocus for planting in Blenheim

Planting stock goes into the ground by 1 May; buy it before that. Within 15 km of Blenheim OpenStreetMap lists 1 market and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Blenheim?

In Blenheim, crocus: plant by 1 May. The winter here is too mild for our late-planting rule, so we give no later limit.

When is the last spring frost in Blenheim?

Last spring frost around 10 August, first autumn frost around 31 May.

Other crops in Blenheim, with their dates