Broccoli Marathon F1 Seeds


Broccoli Marathon F1 Seeds produce large, uniform heads, ideal for home gardens and allotments. This cold-hardy variety is reliable and matures in approximately 90-100 days, providing quality, substantial yields for enthusiasts seeking robust broccoli.

Average Packet Contents: 50 Seeds

The RHS Award of Garden Merit (AGM)

In stock

SKU: I4-1218ZXV Categories: ,

Broccoli Marathon F1 Seeds – Growing Guide


Marathon F1 Broccoli is a highly productive variety, well-suited for both spring and fall production. It is cold-hardy and yields large, uniform central heads followed by sizeable side shoots after the main head is harvested.

Planting Instructions

  • Soil: Prefers well-drained, fertile soil high in organic matter with a pH of 6.0–7.5.
  • Sowing: Sow seeds ¼” deep in a seed-starting mix. Keep the soil moist but not waterlogged.
  • Germination: Typically takes 7-10 days. Keep at 70-85°F for optimal results.
  • Spacing: Transplant seedlings 18-24 inches apart in rows 24-36 inches apart.

Care & Maintenance

  • Light: Requires full sun to partial shade.
  • Water: Maintain consistent moisture. Avoid overwatering to prevent root rot.
  • Fertilization: Use a balanced fertilizer to nourish the plants every few weeks.
  • Cold Tolerance: This variety is cold hardy, suitable for cooler climates.


Harvest the main head before the flower buds open, then continue to harvest side shoots for an extended yield. Expect harvests approximately 90-100 days from seeding under ideal conditions.


Weight 15 g
Latin Name

Brassica Oleracea Botrytis


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