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March Planting Guide for San Diego Gardens: Raised Beds, Containers & In-Ground

March is an ideal month in San Diego to plant a variety of vegetables, herbs, and flowers in raised beds, containers, or directly in the ground. With mild temperatures and minimal frost risk, you can confidently start warm-season crops and continue cool-season harvests.

Plant now (quick list)
Lettuce, Spinach, Radishes, Carrots, Beets, Peas, Broccoli, Kale
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Plant now
  • Lettuce
  • Spinach
  • Radishes
  • Carrots
  • Beets
  • Peas
  • Broccoli
  • Kale
  • Strawberries
  • Herbs (cilantro, parsley)
Start indoors
  • Tomatoes
  • Peppers
  • Eggplants
  • Basil
  • Marigolds
  • Zinnias
  • Cucumbers
  • Melons
Avoid
  • Corn (wait until late March or early April)
  • Beans (wait for warmer soil)
  • Pumpkins
  • Squash (direct sow after last frost risk)
  • Sweet potatoes
Next 2 weeks
  • Harden off indoor seedlings before transplanting
  • Prepare soil with compost for summer crops
  • Monitor for early pests like aphids
  • Thin seedlings for better airflow
  • Water consistently but avoid overwatering

FAQs

Can I plant tomatoes directly in the ground in March?
It's best to start tomatoes indoors this month and transplant after seedlings develop, usually late March to early April.
How often should I water raised beds in March?
Water raised beds 2-3 times per week, adjusting based on rainfall and soil moisture.
Are there any frost concerns in San Diego in March?
Frost is rare but possible in early March; monitor local forecasts and protect sensitive plants if needed.
What soil preparation is recommended before planting?
Incorporate compost or aged manure to improve fertility and drainage before planting.
Can I grow herbs in containers this month?
Yes, herbs like cilantro, parsley, and basil thrive in containers when started in March.

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