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When to plant hyacinths in Santa Rosa: by 14 May

In Santa Rosa, hyacinth: plant by 14 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 Vivero Forestal Provincial Santa Rosa (plant nursery, 3 km) and YPF Agro (farm supply, 5 km); addresses and opening hours are below.

Hyacinth in Santa Rosa: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in July, average 3.9 °C.

Plantingby 14 May
First autumn frost13 June
Coldest nightsJuly, 3.9 °C
Soil back at 1 °C in springalready in the first week of July
Daylight10:13 on 14 May
Daylight at the winter solstice9:39

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

Hyacinth in Santa Rosa: depth, winter cold, pests and pets

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

In Santa Rosa the average daily temperature stays at 10 °C or lower for about 8 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. That is less than the bulbs need, and without more cold they may not flower properly. Where winters are not cold enough for long enough, LSU AgCenter keeps tulip and hyacinth bulbs in the refrigerator for at least six to eight weeks before planting, and plants them only once the soil has cooled: warm soil can cancel the chilling. Keep fruit out of that refrigerator — ripening fruit gives off ethylene, which harms the flowers (Wisconsin Horticulture Extension).

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, LSU AgCenter, ASPCA.

Hyacinth in nearby cities

Around Santa Rosa, San Rafael is 8 days earlier and San Luis 10 days later.

CityDistanceDateDifference
Bahía Blanca293 kmby 16 May2 days later
San Luis414 kmby 24 May10 days later
Neuquén421 kmby 10 May4 days earlier
San Rafael428 kmby 6 May8 days earlier
Mendoza586 kmby 18 May4 days later
Rancagua645 kmby 13 May1 day earlier

Where to buy hyacinth for planting in Santa Rosa

Planting stock goes into the ground by 14 May; buy it before that. Within 15 km of Santa Rosa OpenStreetMap lists 2 garden centres, 4 farm-supply shops, 2 plant nurseries and 1 market (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Santa Rosa?

In Santa Rosa, hyacinth: plant by 14 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 Santa Rosa?

Last spring frost around 25 August, first autumn frost around 13 June.

Other crops in Santa Rosa, with their dates