Red Rock Onion Plants (Short/Intermediate-Day)

Red Rock Onion Plants (Short/Intermediate-Day)

Red Rock is a vibrant, high-performance red onion bred for bold color, sweet-spicy flavor, and excellent storage in transition zones. This Short/intermediate-day variety produces medium-large, globe-shaped bulbs with deep crimson skin and striking purple-red rings that hold their hue through cooking—perfect for fresh salads, grilling, pickling, or long-keeping. Each bundle contains approximately 75 healthy, premium, non-GMO plants grown with natural and regenerative practices.

Key Details at a Glance

• Day length: Intermediate-Day (best in zones 5–9)
• Days to maturity: 100–110 from transplant
• Mature bulb size: 3–4 inches
• Storage life: 5–7 months when cured
• Bundle size: Approximately 75 bare-root plants

Why Grow Red Rock?

• Intense red color – Rich, glossy skin and deep rings; stunning raw or cooked.
• Sweet with a kick – Balanced flavor—milder than storage reds, punchier than sweets.
• Strong keeper – Outperforms most red onions in storage; lasts into winter.
• Market standout – Eye-catching at farm stands; high customer appeal.

Growing Tips Direct-transplant as soon as soil can be worked in early spring (soil ≥40°F). Space 4–6″ apart in rows 12–18″ apart. Provide full sun, consistent moisture (1″ weekly), and occasional nitrogen boosts. Mulch to retain moisture and suppress weeds. Harvest when 50–70% of tops yellow and fall over; cure in a dry, airy spot for 2–3 weeks.

Standard Information

• Plant type: Bulbing onion (Allium cepa)
• Sun: Full sun (6–8+ hours)
• Soil: Well-drained, fertile loam; pH 6.0–7.0
• Water: Consistent, especially during bulb formation
• Hardiness zones: 3–9 (bulbs form best in intermediate-day regions)

Origin & Quality All plants are grown and shipped as bare-root, dormant starts in biodegradable wrap from Sunbelt Transplants, a trusted leader in premium onion transplants based in the heart of U.S. onion country.

Disclaimer Although these onions are grown by farms that are certified organic, we are not allowed to say it is Certified due to the rule 7 CFR § 205.2. The Farm On Central is in the process of becoming a Certified Handler for the 2026 season. All product provided for the 2026 season will be certified.