Cos lettuce · Tseung Kwan O, Sai Kung District, Hong Kong
When to plant cos lettuce in Tseung Kwan O
Main outdoor window
not outdoors here
The window this page is built around.
Timed from last spring frost
no spring frost
In Tseung Kwan O, 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 Tseung Kwan O
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.
Cos lettuce through the year
Against the frost risk in Tseung Kwan O
Why these dates
Sow every ten days from six weeks before the last frost. The upright habit means it can go closer together than a heading type without rotting in the middle.
Takes about -3C. Outer leaves mark after a frost but the heart is usually untouched and can simply be trimmed to.
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. Cos lettuce 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 Tseung Kwan O.
Nearby
Cos lettuce in places close by
Also in Tseung Kwan O
Other vegetables to time
Growing cos lettuce in Tseung Kwan O
How much frost will cos lettuce tolerate?
Takes about -3C. Outer leaves mark after a frost but the heart is usually untouched and can simply be trimmed to.