Planting guide · zone 6b
When to plant sweet potatoes in zone 6b
In zone 6b, the average last spring frost is Apr 21 and the first fall frost is Oct 22. Here is sweet potatoes's whole year, counted from those dates.
May 12Plant slipsSpring
J
F
M
A
M
J
J
A
S
O
N
D
Soil & site
Loose, sandy, low-nitrogen soil in raised ridges — rich ground grows vines instead of roots.
Seedling care
Plant slips (rooted cuttings) well after frost, once soil is thoroughly warm. Water daily the first week while they take.
Growing notes
The vines smother weeds for you. Ease off water in the last month to prevent splitting.
Harvest
Dig before frost, or immediately after vines blacken. Cure at 80–85°F for 10 days — curing is what creates the sweetness.