Cardoon · Caxias do Sul, Rio Grande do Sul, Brazil
When to plant cardoons in Caxias do Sul
Main outdoor window
12 Aug - 9 Sep
The window this page is built around.
Timed from last spring frost
29 July
In Caxias do Sul, on your chosen risk.
Ready to pick
31 Mar - 30 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 Caxias do Sul
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.
Start indoors
3 Jun - 1 Jul
Eight weeks before your last frost, under cover or on a windowsill.
Plant out
12 Aug - 9 Sep
Two weeks after your last frost.
Harvest
31 Mar - 30 May
Cardoons through the year
Against the frost risk in Caxias do Sul
Why these dates
As for globe artichoke: about -10C with a dry crown.
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. Cardoons are timed from 8 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 Caxias do Sul.
Hardiness is not the obstacle here. Caxias do Sul is zone 9b, comfortably inside the range this crop is rated for, so an established plant should come through an average winter without protection.
Do not expect a crop in the first year. A plant set out now should give its first worthwhile pick around year 2, and will then produce every year after that, which is what makes the planting decision worth getting right the first time.
Also in Caxias do Sul
Other vegetables to time
Growing cardoons in Caxias do Sul
When should I plant cardoons in Caxias do Sul?
Aim for 12 Aug - 9 Sep in an average year. If you would rather not gamble on the weather, wait until 15 Sep - 13 Oct - by then frost has finished in nine years out of ten.
When will cardoons be ready to harvest in Caxias do Sul?
Expect to start picking around 31 Mar - 30 May, based on 150 to 180 days to maturity from the planting date calculated for this location.
How much frost will cardoons tolerate?
As for globe artichoke: about -10C with a dry crown.