Safe to Plant

Larkspur · Morelia, Michoacán, Mexico

When to sow larkspurs in Morelia

Main outdoor window

not outdoors here

The window this page is built around.

Timed from last spring frost

no spring frost

In Morelia, on your chosen risk.

First autumn frost

no autumn frost

The far end of the outdoor season.

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

Step by step in Morelia

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.

Frost tolerance
Hardy
Damaged below
-12°C (10.4°F)
Days to flowering
90–110
Hardy to
Zone 2a–10a
Min soil temp
5°C (41°F)
Spacing
25 cm
Sowing depth
5 mm (0.2 in)
Sun
Full

Larkspurs through the year

Against the frost risk in Morelia

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Frost risk Today

Why these dates

Sow direct four weeks before the last frost, into cool soil - the seed germinates below 15C and often refuses above 18C, which is why late sowings fail. Do not start it indoors; the taproot makes transplanting unreliable. Chilling the seed in a fridge for a fortnight before sowing improves germination markedly.

Hardy to about -12C as a seedling, so autumn sowing works well in zone 7 and milder and produces plants twice the size of spring-sown ones. Collapses in humid heat and will not persist through a subtropical 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. Larkspurs are timed for direct sowing 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Morelia.

Morelia sits in zone 10b, which is milder than this crop wants, and a winter that never really arrives is its own problem. The dates below still describe the right time of year; the open question is survival rather than timing.

See every crop timed for Morelia →

Growing larkspurs in Morelia

How much frost will larkspurs tolerate?

Hardy to about -12C as a seedling, so autumn sowing works well in zone 7 and milder and produces plants twice the size of spring-sown ones. Collapses in humid heat and will not persist through a subtropical summer.