Botanical Name: Raphanus sativus
Days to Maturity: 25 days
Hardiness: Frost-tolerant annual
Plant Dimensions: 6"–8" leaf tops
Variety Information: 1" bright red roots with crisp, white interior.
Type: Spring/Summer radish (Learn more)
Attributes: Good for Containers
When to Sow Outside: RECOMMENDED. 4 to 6 weeks before your average last frost date, and when soil temperature is above 40°F, ideally 65°–85°F. Successive Sowings: Every 1 to 2 weeks until late spring. Sow again in late summer until 4 weeks before your average first fall frost date.
When to Start Inside: Not recommended; roots sensitive to disturbance.
Days to Emerge: 5–10 days
Seed Depth: ½"
Seed Spacing: A group of 3 seeds every 3"
Row Spacing: 12"
Thinning: When 1" tall, thin to 3" apart
Harvesting: Harvest when radish is no larger than 1" in diameter. If allowed to grow bigger, 'Rudolf' will get pithy and hot.