Calabrese Marathon F1 RHS Seed

 

Calabrese Marathon F1 (Brassica oleracea var. italica L.) is a premium hybrid broccoli variety recognised by the RHS for its uniform, large, and tightly packed heads.

 

This early maturing hybrid is perfect for gardeners seeking reliable, high yielding broccoli with excellent flavour and texture.

 

Marathon F1 produces firm, dark green heads on strong, vigorous stems, ideal for fresh cooking, steaming, roasting, or freezing.

 

Its strong disease resistance and uniform growth make it a dependable choice for home gardens, allotments, and polytunnel cultivation.

 

Seed Qty: Approx. 10 seeds

 

Sow: February – April (indoors)

Germination: 7 – 14 days

Soil Type: Fertile, well-drained soil with slightly acidic to neutral pH

Height/Spread: 50–70 cm / 40–50 cm

Harvesting: 10–12 weeks after sowing

Companion Plants: Celery, Onions, Lettuce

Avoid Planting With: Strawberries, Tomatoes

 

Sowing Instructions

 

Indoors/Polytunnel: Sow seeds in trays or small pots filled with fine, fertile compost from February to April. Maintain soil moisture and temperature around 18–20°C. Prick out seedlings into larger pots once strong enough and harden off before planting outdoors or in a polytunnel.

 

Outdoors: Transplant seedlings into fertile, well-drained soil in a sunny, sheltered location after the last frost. Space plants 40–50 cm apart to allow for optimal growth and air circulation. Regular watering and feeding encourage large, healthy heads.

 

Harvesting: Cut heads when firm and fully developed. Side shoots may continue producing smaller heads for an extended harvest period.

 

Calabrese Marathon F1 RHS is perfect for gardeners seeking a dependable, early-maturing, and high-yield broccoli. Its hybrid vigour, disease resistance, and RHS recognition make it an excellent addition to any vegetable garden.