Here's a general guideline for seed-starting dates in the Twin Cities area. (Move the date a week earlier for every 100 miles south of the metro area, and a week later for every 100 miles north.)
When to start seeds
For the Minnesota Star Tribune
February 5, 2008 at 9:16PM
EARLY TO MID-MARCH
Ageratum
Bells of Ireland
Celosia
Seed dahlias
Dianthus
Gomphrena
Nicotiana
Salvia
Snapdragons
Sweet alyssum
Vinca
EARLY APRIL
Hollyhocks
Cleome
Gloriosa daisies
Helichrysum
Marigolds
Annual phlox
Verbena
Broccoli
Cabbage
Eggplant
Head lettuce
Peppers
Tomatoes
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