Zone 3B — March
What to Plant in March in Zone 3B
March in Zone 3B:
94 crops to start indoors,
0 to plant or direct sow outside, and
0 entering harvest window.
Last frost averages May 18. Reference city: International Falls, MN.
94 Start Indoors
0 Plant Outside
0 Harvest
Start Indoors in March
| Plant | Type | Start Indoors | Transplant Outside | Harvest Window |
|---|---|---|---|---|
| Charleston Wakefield Cabbage | brassica | Mar 23 | Apr 27 | Jul 6 |
| Early Jersey Wakefield Cabbage | brassica | Mar 23 | Apr 27 | Jul 1 – Jul 11 |
| Michihili Cabbage | brassica | Mar 23 | Apr 27 | Jul 6 |
| Red Acre Cabbage | brassica | Mar 23 | Apr 27 | Jul 11 – Jul 16 |
| Alexandria Alpine Strawberry | berry | Mar 9 | May 25 | Perennial — see plant page |
| All Season Cabbage | brassica | Mar 30 | May 4 | Jul 13 – Jul 23 |
| All Year Round Cauliflower | brassica | Mar 30 | May 4 | Jul 8 |
| Angelica | herb | Mar 16 | May 18 | Aug 6 – Aug 16 |
| Brunswick Cabbage | brassica | Mar 30 | May 4 | Aug 2 |
| Calabrese Broccoli | brassica | Mar 30 | May 4 | Jul 8 |
| Carentan Leeks | allium | Mar 16 | May 4 | Aug 2 – Aug 22 |
| Catmint | herb | Mar 30 | May 18 | Perennial — see plant page |
| Copenhagen Cabbage | brassica | Mar 30 | May 4 | Jul 8 |
| Danish Ballhead Cabbage | brassica | Mar 30 | May 4 | Aug 12 – Aug 22 |
| Di Cicco Broccoli | brassica | Mar 30 | May 4 | Jun 18 – Jun 21 |
| Drumhead Cabbage | brassica | Mar 30 | May 4 | Aug 2 – Aug 12 |
| Early Purple Broccoli | brassica | Mar 30 | May 4 | Jul 8 |
| Giant Maximum Mix Snapdragon Flowers | flower | Mar 16 | May 18 | Aug 6 – Aug 21 |
| Giant Musselburgh Leeks | allium | Mar 16 | May 4 | Aug 17 |
| Glory of Enkhuizen Cabbage | brassica | Mar 30 | May 4 | Aug 2 |
| Golden Acre Cabbage | brassica | Mar 30 | May 4 | Jul 8 |
| Igloo Cauliflower | brassica | Mar 30 | May 4 | Jul 8 – Jul 13 |
| Imperial Star Artichoke | vegetable | Mar 16 | May 18 | Aug 16 – Aug 26 |
| OG American Flag Leeks | allium | Mar 16 | May 4 | Aug 2 – Aug 12 |
| Ox-Eye Daisy Flowers | flower | Mar 16 | May 18 | Perennial — see plant page |
| Savoy Perfection Cabbage | brassica | Mar 30 | May 4 | Aug 2 – Aug 7 |
| Shasta Daisy Flowers | flower | Mar 16 | May 18 | Perennial — see plant page |
| Snowball Self-Blanche Cauliflower | brassica | Mar 30 | May 4 | Jul 8 |
| Southport Red Globe Onions | allium | Mar 16 | May 18 | Sep 15 |
| Southport White Globe Onions | allium | Mar 16 | May 18 | Sep 15 |
| Spanish Sweet White Onions | allium | Mar 16 | May 18 | Sep 5 – Sep 15 |
| Sweet Woodruff | herb | Mar 30 | May 18 | Perennial — see plant page |
| Tansy | herb | Mar 30 | May 18 | Perennial — see plant page |
| Victoria Rhubarb | vegetable | Mar 16 | May 4 | Perennial — see plant page |
| Violetta Purple Cauliflower | brassica | Mar 30 | May 4 | Jul 8 |
| Wormwood | herb | Mar 30 | May 18 | Perennial — see plant page |
| Aji Dulce Peppers | pepper | Mar 30 | Jun 1 | Aug 30 – Sep 19 |
| Anaheim Peppers | pepper | Mar 30 | Jun 1 | Aug 17 – Aug 25 |
| Ancho Grande Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Beefsteak Tomatoes | tomato | Mar 30 | Jun 1 | Aug 20 – Aug 25 |
| Big Jim Hatch Chile | pepper | Mar 23 | Jun 1 | Aug 10 – Aug 15 |
| Birds Eye Hot Peppers | pepper | Mar 30 | Jun 1 | Sep 9 – Sep 19 |
| Brandywine Tomatoes | tomato | Mar 30 | Jun 1 | Aug 20 – Aug 30 |
| Casper Eggplant | vegetable | Mar 30 | Jun 1 | Aug 15 |
| Cayenne Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 25 |
| Cherokee Purple Tomatoes | tomato | Mar 30 | Jun 1 | Aug 18 – Aug 25 |
| Cherry Bomb peppers | pepper | Mar 16 | Jun 1 | Aug 15 – Aug 20 |
| Chinese 5-Color Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Chocolate Bell Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 5 – Aug 20 |
| Chocolate Habanero Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 25 – Sep 14 |
| Corno di Toro Pepper | pepper | Mar 23 | Jun 1 | Aug 15 – Aug 20 |
| Datil peppers | pepper | Mar 16 | Jun 1 | Aug 30 – Sep 19 |
| Devils Tongue Yellow Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 30 – Sep 19 |
| Emerald Giant Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Fish Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 20 |
| Florida Market Eggplant | vegetable | Mar 30 | Jun 1 | Aug 20 – Aug 30 |
| Fresno Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Gochugaru Korean Peppers | pepper | Mar 30 | Jun 1 | Aug 15 |
| Golden Marconi Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 5 – Aug 20 |
| Hatch Green Chile (NM 6-4) Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 20 |
| Holiday Marbles Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 30 – Sep 19 |
| Hungarian Hot Wax Pepper | pepper | Mar 23 | Jun 1 | Aug 5 – Aug 15 |
| Jalapeño Peppers | pepper | Mar 30 | Jun 1 | Aug 5 – Aug 15 |
| Lemon Habanero Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 25 – Sep 14 |
| Long Green Louisiana Eggplant | vegetable | Mar 30 | Jun 1 | Aug 5 – Aug 10 |
| Long Ping Tung Eggplant | vegetable | Mar 30 | Jun 1 | Jul 26 – Jul 31 |
| Long Purple Italian Eggplant | vegetable | Mar 30 | Jun 1 | Aug 15 |
| Mariachi Peppers | pepper | Mar 30 | Jun 1 | Aug 6 – Aug 15 |
| Mortgage Lifter Tomatoes | tomato | Mar 30 | Jun 1 | Aug 20 – Aug 25 |
| Orange Habanero Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 25 – Sep 14 |
| Orange Horizon Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Pandora Striped Eggplant | vegetable | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Pasilla de Oaxaca Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Pepperoncini Pepper | pepper | Mar 30 | Jun 1 | Aug 5 – Aug 15 |
| Pimento Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 25 – Aug 30 |
| Poblano Peppers | pepper | Mar 30 | Jun 1 | Aug 5 |
| Purple Beauty Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 15 |
| Purple Tiger Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 30 – Sep 9 |
| Red Caribbean Habanero Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 25 – Sep 14 |
| Red Cayenne Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Red Cherry Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Red Mushroom Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Round Mauve Eggplant | vegetable | Mar 30 | Jun 1 | Aug 20 – Aug 30 |
| San Marzano Tomatoes | tomato | Mar 30 | Jun 1 | Aug 18 – Aug 28 |
| Santa Fe Grande Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Serrano Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 20 |
| Sunbright Yellow Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 20 |
| Tabasco Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 20 – Aug 30 |
| Thai Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Turkish Orange Eggplant | vegetable | Mar 30 | Jun 1 | Aug 25 – Aug 30 |
| White Cloud Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 15 |
| Yellow Jalapeno (Caloro) Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Yellow Mushroom Hot Peppers | pepper | Mar 30 | Jun 1 | Aug 15 – Aug 25 |
| Yolo Wonder Sweet Peppers | pepper | Mar 30 | Jun 1 | Aug 10 – Aug 20 |
Plant Outside in March
Nothing to plant or sow outside in March for Zone 3B.
Next window: April — 14 varieties, including Candy Onion, Charleston Wakefield Cabbage, Chervil.
Harvest in March
Nothing to harvest in March for Zone 3B.
Next window: May — 3 varieties, including Black Oil Sunflower Microgreens, Rambo Radish Microgreens, Speckled Pea Shoot Microgreens.
Key Tasks for March in Zone 3B
- 1 Start 94 varieties indoors this month under grow lights or in a sunny south-facing window. Use a seed-starting mix and bottom heat (70–75°F) for best germination rates.
- 2 Check soil moisture before watering — stick a finger 2 inches into the soil. Water only when the soil is dry at that depth. Consistent moisture is more important than frequency.
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