Vegetables to Plant in March
March is a critical month for vegetable gardening. Those who start the season early get more harvest from summer crops. In this guide, you'll find all the vegetables you can plant in March with sowing details.
Info
This guide is prepared for temperate climate regions. A 2-3 week delay is normal for continental climate areas.
March Planting Calendar
Direct Sowing Outdoors
| Vegetable | Early March | Mid-March | Late March |
|---|---|---|---|
| Peas | Yes | Yes | Yes |
| Broad beans | Yes | Yes | Caution |
| Spinach | Yes | Yes | Yes |
| Lettuce | Yes | Yes | Yes |
| Radish | Yes | Yes | Yes |
| Carrots | Caution | Yes | Yes |
| Onion (transplants) | Yes | Yes | Yes |
| Potatoes | Caution | Yes | Yes |
Yes = Ideal | Caution = Depends on conditions
Indoor Seedling Starting
| Vegetable | Start Seedlings | Transplant Outdoors |
|---|---|---|
| Tomatoes | Early March | May |
| Peppers | Early March | May |
| Eggplant | Early March | May |
| Squash | Late March | Late April |
| Cucumbers | Late March | Early May |
Direct Sowing Outdoors
Peas
Garden Tip
Peas are cold-tolerant and among the best vegetables for early sowing. Plant as soon as frost risk decreases!
| Specification | Value |
|---|---|
| Sowing depth | 3-5 cm |
| Seed spacing | 5-8 cm |
| Row spacing | 40-60 cm |
| Germination | 7-14 days |
| Harvest | 60-70 days |
- 1
Soil Preparation
Deep digging. Peas fix nitrogen, so they need little fertilizer. - 2
Soak Seeds
Soak seeds in water 12-24 hours before planting. Speeds germination. - 3
Sowing
Plant 3-5 cm deep, 5-8 cm apart. - 4
Support
Prepare trellis or netting for climbing varieties.
Spinach
| Specification | Value |
|---|---|
| Sowing depth | 1-2 cm |
| Seed spacing | 5-10 cm |
| Row spacing | 25-30 cm |
| Germination | 7-14 days |
| Harvest | 40-50 days |
Spinach Sowing Tips:
- Prefers partial shade (prevents leaf burn)
- Sow densely, harvest by thinning
- Bolts (flowers) in hot weather
Lettuce
| Specification | Value |
|---|---|
| Sowing depth | 0.5-1 cm (very shallow!) |
| Seed spacing | 15-20 cm |
| Row spacing | 30 cm |
| Germination | 5-10 days |
| Harvest | 45-60 days |
Warning
Lettuce seeds need light to germinate. Don't bury too deep - just press into the soil.
Succession Planting: Sow every 2 weeks for continuous harvest.
Radish
The fastest-producing vegetable! Ideal for beginners.
| Specification | Value |
|---|---|
| Sowing depth | 1-2 cm |
| Seed spacing | 3-5 cm |
| Row spacing | 15-20 cm |
| Germination | 3-7 days |
| Harvest | 25-35 days |
Varieties:
- Red radish: Classic, quick
- White radish (Daikon): Long, late harvest
- Black radish: For winter, slow growth
Carrots
| Specification | Value |
|---|---|
| Sowing depth | 0.5-1 cm |
| Seed spacing | 3-5 cm (with thinning) |
| Row spacing | 25-30 cm |
| Germination | 14-21 days |
| Harvest | 70-80 days |
Garden Tip
Carrot germination is slow. Mix radish seeds with carrots when sowing - radishes sprout quickly and mark the row.
Soil Requirements:
- Deep, stone-free soil
- Don't use fresh manure (causes forking)
- Sandy soil is ideal
Onions (Transplants or Sets)
| Specification | Value |
|---|---|
| Planting depth | 2-3 cm (tip visible) |
| Seedling spacing | 10-15 cm |
| Row spacing | 25-30 cm |
| Harvest | 90-120 days |
Planting Methods:
- Onion sets: Easiest, March is ideal
- Transplants: Wide variety choice
- Seeds: Should have started in January-February
Potatoes
| Specification | Value |
|---|---|
| Planting depth | 10-15 cm |
| Tuber spacing | 30-35 cm |
| Row spacing | 60-75 cm |
| Harvest | 90-120 days |
- 1
Seed Potato Prep
Sprout seed potatoes 2-3 weeks ahead in a bright, cool location. - 2
Cutting
Cut large tubers into pieces with 2-3 eyes each. Let cuts dry. - 3
Planting
Plant 10-15 cm deep with eyes facing up. - 4
Hilling
Hill up soil when shoots are 15-20 cm tall. Repeat 2-3 times.
Indoor Seedling Starting
Tomatoes
Start early March, transplant outdoors in May.
| Stage | Duration | Conditions |
|---|---|---|
| Germination | 7-14 days | 20-25°C, moist |
| Seedling growth | 6-8 weeks | 18-22°C, bright |
| Hardening off | 1-2 weeks | Outdoor acclimation |
Tomato Seed Variety Set
$10
Peppers
Start early March, transplant mid to late May outdoors.
| Stage | Duration | Conditions |
|---|---|---|
| Germination | 10-14 days | 25-30°C, moist |
| Seedling growth | 8-10 weeks | 20-25°C, bright |
| Hardening off | 2 weeks | Outdoor acclimation |
Info
Temperature is critical for pepper germination! Below 20°C, germination is very slow.
Eggplant
Same timing as peppers, similar conditions.
| Stage | Duration | Conditions |
|---|---|---|
| Germination | 10-14 days | 25-30°C |
| Seedling growth | 8-10 weeks | 20-25°C |
Squash and Cucumbers
Start late March, they grow fast.
| Stage | Duration | Notes |
|---|---|---|
| Germination | 5-7 days | Fast germination |
| Seedling time | 3-4 weeks | Don't hold too long |
| Planting | Late April | After frost risk passes |
Garden Tip
Squash and cucumbers don't like transplanting. Direct sowing outdoors is also an option (late April).
Seedling Starting Materials
Basic Needs
Complete Seedling Growing Kit
$39
Seedling Starting Tips
- 1
Sterile Soil
Use seedling soil (potting mix). Garden soil carries disease. - 2
Moisture Control
Soil should be moist but not wet. Use plastic dome. - 3
Temperature
20-25°C is ideal for most vegetables. Consider a heat mat. - 4
Light
After germination, 12-16 hours of light daily. South window or grow light. - 5
Air
Remove plastic dome after germination. Air circulation is essential.
Regional Planting Calendar
USDA Zones 8-10 (Warm Climates)
- Direct sow most vegetables in March
- Tomatoes and peppers can go outdoors by late March
- Start succession planting
USDA Zones 6-7 (Temperate Climates)
- Start warm-season crops indoors
- Direct sow cold-hardy vegetables (peas, lettuce, spinach)
- Prepare beds for April transplanting
USDA Zones 3-5 (Cold Climates)
- March is still indoor seed-starting time
- Plan garden layout, order seeds
- Start cool-season crops indoors
USDA Zone 10+ (Subtropical)
- Full outdoor planting season
- Watch for early heat stress
- Provide afternoon shade for cool-season crops
March Planting Checklist
Direct to Garden
- Peas
- Broad beans
- Spinach
- Lettuce
- Arugula
- Radish
- Carrots
- Beets
- Onion (transplants/sets)
- Potatoes
Indoor Seedlings
- Tomatoes
- Peppers
- Eggplant
- Squash (late March)
- Cucumbers (late March)
- Watermelon/Melon (late March)
Preparation
- Soil preparation
- Seedling soil acquisition
- Seed ordering
- Seed tray preparation
- Create planting calendar
Common Mistakes
1. Direct Sowing Too Early
Problem: Soil is cold, seeds rot Solution: Wait for soil temperature to exceed 10°C
2. Planting Too Deep
Problem: Seeds can't emerge Solution: General rule: 2-3 times the seed diameter depth
3. Transplanting Seedlings Too Early
Problem: Frost damage, shock Solution: Harden off plants, wait for last frost date
4. Insufficient Light (Seedlings)
Problem: Tall, weak seedlings Solution: Sunny window or grow light
5. Overwatering
Problem: Root rot, fungus Solution: Soil should be moist, not wet
Conclusion
March is the month when vegetable garden foundations are laid. Proper timing means abundant harvest all summer.
Must plant in March:
- Peas and broad beans (cold-tolerant)
- Leafy vegetables (lettuce, spinach, arugula)
- Root vegetables (radish, carrots)
- Warm-loving seedlings indoors (tomatoes, peppers)
Follow this list and let your table be filled with vegetables you grew yourself this summer!
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