Wallflower · Guarulhos, São Paulo, Brazil

When to plant wallflowers in Guarulhos

Main outdoor window

year-round warmth

A climate estimate. Check your soil, forecast and cultivar.

Timed from temperature

every month

No frost on record in Guarulhos, so the months this crop fits in our temperature model set the timing. This does not confirm local suitability.

First autumn frost

no autumn frost

The far end of the outdoor season.

Temperature-based estimate. Guarulhos has no dependable frost season. These dates do not account for rain, humidity or waterlogging. Check the local growing season, especially in monsoon climates, before treating this window as a planting recommendation.
Rainfall check: the wettest month is January (about 228 mm), and the driest is August (about 37 mm). Compare all months and check the limitations before choosing the season.

Step by step in Guarulhos

Download these planting dates (.ics)

Import into Apple Calendar, Google Calendar or Outlook. Dates use the selected risk level and are planning estimates, not frost alerts.

Each window is a planning range. Check the forecast, soil and cultivar before planting; a later date is not automatically safer in hot or wet conditions.

Move to final position

1 Jul - 30 Jun

Monthly average temperatures fit the model all year. This does not rule out heatwaves or establish year-round suitability. Check rainfall, drainage, day length and cultivar needs.

Frost tolerance

Very-hardy

Damaged below

-20°C (-4°F)

Days to flowering

300–340

Hardy to

Zone 5a–9a

Min soil temp

13°C (55.4°F)

Spacing

30 cm

Sowing depth

5 mm (0.2 in)

Sun

Full

Wallflowers through the year

Against the monthly temperature record in Guarulhos

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Wallflowers

Frost risk Sow direct Today

Open My Garden

Seasonal context

Rainfall and the growing season in Guarulhos

January has the highest average precipitation (228 mm); August has the lowest (37 mm). Compare this pattern with the planting windows and your water supply.

Jan 228 mm

Feb 177 mm

Mar 154 mm

Apr 91 mm

May 68 mm

Jun 55 mm

Jul 62 mm

Aug 37 mm

Sep 68 mm

Oct 106 mm

Nov 150 mm

Dec 185 mm

During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.

Frost-free does not mean every month is suitable. In tropical and monsoon climates, rainfall, heat, drainage and the cultivar can set the practical growing season. Match the temperature window to these conditions and check advice from a local grower before buying planting material.

Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.

Monthly growing conditions in Guarulhos

Compare the planting window with the local temperature pattern. These are historical monthly averages, not this year's forecast or measured soil temperatures. Average frost days do not tell you whether a particular night will freeze.

NASA POWER climate averages, 1995–2023
Month	Average low	Average high
January	19.3°C (66.8°F)	27.5°C (81.6°F)
February	19.2°C (66.6°F)	27.6°C (81.6°F)
March	18.6°C (65.5°F)	26.8°C (80.2°F)
April	16.6°C (61.9°F)	25.4°C (77.8°F)
May	13.8°C (56.8°F)	23.1°C (73.6°F)
June	12.7°C (54.8°F)	22.7°C (72.8°F)
July	12°C (53.6°F)	22.9°C (73.1°F)
August	12.7°C (54.9°F)	24.7°C (76.5°F)
September	14.5°C (58°F)	26.7°C (80°F)
October	16°C (60.8°F)	27.2°C (81°F)
November	16.7°C (62°F)	26.8°C (80.3°F)
December	18.3°C (64.9°F)	27.6°C (81.7°F)

For wallflowers, also check drainage, sunlight and cultivar requirements. See the rainfall context above; humidity, irrigation and local pest pressure are not calculated.

The catalog flowering or harvest months are not verified for this frost-free climate. Ask a local grower about the cultivar’s seasonal cycle.

Local growing check

Before choosing wallflowers for Guarulhos

January is the wettest month in the rainfall grid, averaging about 228 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.

The temperature and rainfall tables on this page show the underlying climate estimates. How these suitability checks work · Record what happens in your garden.

Before you plant wallflowers

Use the calendar to plan ahead, then check the conditions in your own garden.

Measure the soil at sowing depth. Aim for at least 13°C (55.4°F); the calendar estimates soil warmth from air temperatures and cannot measure your bed.
In a frost-free climate, check seasonal rainfall, humidity and heat before planting. A month with suitable average temperatures can still be too wet, dry or hot for this crop.
Harden off plants raised indoors: gradually expose them to outdoor light, wind and temperature before their final move into the bed.
Use the maturity range on your seed packet when choosing a variety. Cold, short days and transplant stress can make harvest later than the calendar estimate.

Keep wallflower roots drained and check its life cycle

Choose a sunny position with very good drainage. Avoid the assumption that extra feeding and frequent watering will improve every plant; soft growth and wet roots can shorten the useful life of a wallflower. Space plants for airflow at their mature width.

After flowering, decide whether seed is wanted or whether to clear tired plants for the next crop. Inspect the base before retaining an old plant for another season. Record which strain produces a good display in your conditions rather than relying on the common name to predict longevity.

What to record this season

Did plants remain healthy after flowering, and was replacing or retaining them more successful? Add the cultivar, sowing date and conditions to your growing record so you can compare next season.

Further reading: NC State Extension: Erysimum cheiri . General crop guidance; local dates on this site are calculated separately. Source checked 19 September 2026 by Safe to Plant; this is not an expert review.

The reference describes plant identity and cultivation. Its regional calendar months and hardiness observations do not validate the calculated dates for another location.

How the dates are calculated and their limits · Keep a growing record · Report a local discrepancy

Why these dates

Frost-relative timing needs a dependable seasonal frost date. Guarulhos has no such date in this record, so this page compares monthly temperatures with the crop's model range instead. Local wet and dry seasons, day length and cultivar requirements still need a separate check.

The model uses a growing-temperature band for wallflowers between 13°C (55.4°F) and 25°C (77°F) — and in Guarulhos every monthly mean falls inside that range, which is why the headline says "year-round warmth". Monthly averages can hide unsuitable hot spells. This temperature result does not establish a year-round planting recommendation: check rainfall, drainage, day length and cultivar requirements.

Guarulhos sits in zone 11a, which is above the catalog range. Confirm the exact cultivar locally; a zone number alone cannot measure summer heat or winter chill. The calculated dates do not confirm that this crop is suitable here. Check cultivar requirements and local growing experience before planting.

This is a two-season crop, so the dates above describe a sowing in one year and a flowering in the next. The plant spends the winter in the ground as a small rosette, which is why the frost-free season in Guarulhos does not limit it the way it would limit a tomato: it is not trying to finish before the cold arrives, it is trying to be well enough rooted to sit through it. Sowing too late is the real risk, because a plant that goes into winter undersized often fails to flower at all the following year.

See every crop timed for Guarulhos →

Nearby

Wallflowers in places close by

São Paulo 14 km Mairiporã 17 km São Caetano do Sul 18 km Ferraz de Vasconcelos 19 km Itaquaquecetuba 19 km Poá 21 km

Also in Guarulhos

Other flowers to time

Tulips very hardy Daffodils very hardy Dahlias tender Sunflowers tender Crocuses very hardy Peonies very hardy Calendulas hardy Hyacinths very hardy Sweet peas hardy Pansies very hardy Snowdrops very hardy Zinnias tender

Growing wallflowers in Guarulhos

Can I grow wallflowers in Guarulhos?

The calendar estimates a planting window, not a guarantee of success. January is the wettest month in the rainfall grid, averaging about 228 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.

When should I plant wallflowers in Guarulhos?

Guarulhos has no dependable frost season, and monthly averages fit the temperature model for wallflowers all year. This is not a year-round recommendation: check rainfall, heatwaves, day length and cultivar needs. The crop maturity guide is 300 to 340 days under suitable conditions.

How much frost will wallflowers tolerate?

Check the named variety and local forecast before exposing young growth. The catalog cold-damage figure is a reference, not a guarantee: plant age, acclimatisation, wind and the duration of a freeze affect damage.