Hardy geranium · Formosa, Formosa, Argentina
When to sow hardy geraniums in Formosa
Main outdoor window
8 Aug - 5 Sep
The window this page is built around.
Timed from last spring frost
25 July
In Formosa, on your chosen risk.
Ready to pick
29 Oct - 30 Mar
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 Formosa
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.
Plant out
8 Aug - 5 Sep
Two weeks after your last frost.
In flower
29 Oct - 30 Mar
Hardy geraniums through the year
Against the frost risk in Formosa
Why these dates
Plant out in spring or autumn, spacing at 45cm so the plants knit together by midsummer. Shear the whole plant to the ground after the first flush in midsummer; fresh foliage and a second flowering follow in three weeks.
Hardy to -30C and largely evergreen in mild winters. Tolerates dry shade, poor soil and root competition from trees, which is a rare combination.
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. Hardy geraniums are timed with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Formosa.
Formosa sits in zone 10a, 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.
Do not expect a crop in the first year. A plant set out now should give its first worthwhile pick around year 1, and will then produce every year after that, which is what makes the planting decision worth getting right the first time.
Nearby
Hardy geraniums in places close by
Also in Formosa
Other flowers to time
Growing hardy geraniums in Formosa
When should I plant hardy geraniums in Formosa?
Aim for 8 Aug - 5 Sep in an average year. If you would rather not gamble on the weather, wait until 3 Sep - 1 Oct - by then frost has finished in nine years out of ten.
When will hardy geraniums be ready to harvest in Formosa?
Expect to start picking around 29 Oct - 30 Mar, based on 100 to 130 days to maturity from the planting date calculated for this location.
How much frost will hardy geraniums tolerate?
Hardy to -30C and largely evergreen in mild winters. Tolerates dry shade, poor soil and root competition from trees, which is a rare combination.