Cornflower · Puebla, Puebla, Mexico

When to sow cornflowers in Puebla

Main outdoor window

25 Dec - 22 Jan

The window this page is built around.

Timed from last spring frost

15 January

In Puebla, on your chosen risk.

Ready to pick

28 Feb - 20 Mar

If you plant at the start of the window.

The average last frost. Half of all years are later than this.

Cautious Balanced Bold

Step by step in Puebla

Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.

Start indoors

4 Dec - 1 Jan

Six weeks before your last frost, under cover or on a windowsill.

Sow direct

25 Dec - 22 Jan

Three weeks before your last frost.

Plant out

1-29 Jan

Two weeks before your last frost.

In flower

28 Feb - 20 Mar

Sow in succession. A single sowing gives you a single glut. Sow a short row every 21 days through the window above and you get a steady supply instead.

Frost tolerance

Hardy

Damaged below

-10°C (14°F)

Days to flowering

65–85

Hardy to

Zone 2a–11a

Min soil temp

7°C (44.6°F)

Spacing

25 cm

Sowing depth

10 mm (0.4 in)

Sun

Full

Cornflowers through the year

Against the frost risk in Puebla

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Cornflowers

Frost risk Start indoors Sow direct Plant out Harvest Today

Why these dates

Sow direct three weeks before the last frost, thinly and where it is to flower - it resents transplanting once the taproot is down. Deadhead relentlessly, because a plant allowed to set seed stops flowering within a fortnight. An autumn sowing gives much taller, sturdier plants.

Hardy to about -10C as a young plant, which is what makes autumn sowing possible in zone 7 and milder. Dislikes humid heat and finishes early in a hot summer.

Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Cornflowers are timed from 6 weeks before that frost for an indoor start, with planting out 2 weeks before it, and this page simply resolves those offsets against the frost date computed for Puebla.

Hardiness is not the obstacle here. Puebla is zone 10b, comfortably inside the range this crop is rated for, so an established plant should come through an average winter without protection.

The median frost-free season here is 311 days, against 65 to 85 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.

See every crop timed for Puebla →

Nearby

Cornflowers in places close by

Ciudad Nezahualcoyotl 93 km Iztapalapa 96 km Mexico City 105 km Gustavo Adolfo Madero 107 km Ecatepec de Morelos 109 km

Also in Puebla

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 cornflowers in Puebla

When should I plant cornflowers in Puebla?

Aim for 25 Dec - 22 Jan in an average year. If you would rather not gamble on the weather, wait until 25 Dec - 22 Jan - by then frost has finished in nine years out of ten.

When will cornflowers be ready to harvest in Puebla?

Expect to start picking around 28 Feb - 20 Mar, based on 65 to 85 days to maturity from the planting date calculated for this location.

How much frost will cornflowers tolerate?

Hardy to about -10C as a young plant, which is what makes autumn sowing possible in zone 7 and milder. Dislikes humid heat and finishes early in a hot summer.