Safe to Plant

Forget-me-not · Saltillo, Coahuila, Mexico

When to sow forget-me-nots in Saltillo

Main outdoor window

27 Mar - 24 Apr

The window this page is built around.

Timed from last spring frost

13 February

In Saltillo, on your chosen risk.

Ready to pick

1 Apr - 31 May

If you plant at the start of the window.

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

Step by step in Saltillo

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.

Sow direct

27 Mar - 24 Apr

Six weeks after your last frost.

Move to final position

3-31 Jul

20 weeks after your last frost.

In flower

1 Apr - 31 May

Frost tolerance
Very-hardy
Damaged below
-20°C (-4°F)
Days to flowering
300–335
Hardy to
Zone 3a–9a
Min soil temp
13°C (55.4°F)
Spacing
20 cm
Sowing depth
2 mm (0.1 in)
Sun
Partial

Forget-me-nots through the year

Against the frost risk in Saltillo

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

Frost risk Sow direct Plant out Harvest Today

Why these dates

Sow in early summer, six weeks after the last frost, and move the seedlings in autumn to wherever the spring bulbs are planted. Flowers the following April and May, then pull the plants out as they brown and shake them over the bed to sow next year's crop.

Hardy to about -20C as a rosette. Needs a cold winter, and mildews badly in a humid summer, which is why it is best pulled as soon as flowering finishes.

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. Forget-me-nots are timed with planting out 20 weeks after it, and this page simply resolves those offsets against the frost date computed for Saltillo.

Saltillo sits in zone 9b, 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.

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 Saltillo 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 Saltillo →

Growing forget-me-nots in Saltillo

When should I plant forget-me-nots in Saltillo?

Aim for 27 Mar - 24 Apr in an average year. If you would rather not gamble on the weather, wait until 22 Apr - 20 May - by then frost has finished in nine years out of ten.

When will forget-me-nots be ready to harvest in Saltillo?

Expect to start picking around 1 Apr - 31 May, based on 300 to 335 days to maturity from the planting date calculated for this location.

How much frost will forget-me-nots tolerate?

Hardy to about -20C as a rosette. Needs a cold winter, and mildews badly in a humid summer, which is why it is best pulled as soon as flowering finishes.