Sweet potato · Ludhiana, Punjab, India
When to plant sweet potatoes in Ludhiana
Main outdoor window
29 Jan - 12 Feb
The window this page is built around.
Timed from last spring frost
8 January
In Ludhiana, on your chosen risk.
Ready to pick
29 Apr - 29 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 Ludhiana
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
29 Jan - 12 Feb
Three weeks after your last frost.
Harvest
29 Apr - 29 May
Sweet potatoes through the year
Against the frost risk in Ludhiana
Why these dates
Plant slips three weeks after last frost into soil at 18C or above. In cool climates, black plastic mulch is the difference between a crop and a disappointment.
Damaged at 1C - even a near-frost harms the roots. Lift before the first frost, not after it.
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. Sweet potatoes are timed with planting out 3 weeks after it, and this page simply resolves those offsets against the frost date computed for Ludhiana.
Also in Ludhiana
Other vegetables to time
Growing sweet potatoes in Ludhiana
When should I plant sweet potatoes in Ludhiana?
Aim for 29 Jan - 12 Feb in an average year. If you would rather not gamble on the weather, wait until 13-27 Feb - by then frost has finished in nine years out of ten.
When will sweet potatoes be ready to harvest in Ludhiana?
Expect to start picking around 29 Apr - 29 May, based on 90 to 120 days to maturity from the planting date calculated for this location.
How much frost will sweet potatoes tolerate?
Damaged at 1C - even a near-frost harms the roots. Lift before the first frost, not after it.