Zinnia · Tai Po, Tai Po, Hong Kong
When to sow zinnias in Tai Po
Main outdoor window
not outdoors here
The window this page is built around.
Timed from last spring frost
no spring frost
In Tai Po, 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 Tai Po
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.
Zinnias through the year
Against the frost risk in Tai Po
Why these dates
Direct sowing after last frost usually beats transplanting - zinnias dislike root disturbance and catch up quickly.
Killed by the first frost at either end of the season. Strictly a warm-season flower.
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. Zinnias are timed from 4 weeks before that frost for an indoor start, with planting out 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Tai Po.
Also in Tai Po
Other flowers to time
Growing zinnias in Tai Po
How much frost will zinnias tolerate?
Killed by the first frost at either end of the season. Strictly a warm-season flower.