Basil · Phnom Penh, Phnom Penh, Cambodia
When to plant basil in Phnom Penh
Main outdoor window
not outdoors here
The window this page is built around.
Timed from last spring frost
no spring frost
In Phnom Penh, 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 Phnom Penh
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.
Basil through the year
Against the frost risk in Phnom Penh
Why these dates
Plant out two weeks after last frost, once nights are reliably above 12C. A second sowing in midsummer replaces plants that have gone to flower.
Damaged at 1C, before any actual frost forms. If your forecast shows 2C, basil should already be indoors.
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. Basil are timed from 4 weeks before that frost for an indoor start, with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Phnom Penh.
Growing basil in Phnom Penh
How much frost will basil tolerate?
Damaged at 1C, before any actual frost forms. If your forecast shows 2C, basil should already be indoors.