Watermelon Radish

Radish

45d to harvest

Sink your spoon into a jewel-bright slice of Watermelon Radish—crisp, juicy flesh that blooms from a vivid white edge into a rosy, watermelon-like blush. This 45-day radish forms a smooth, round root with a mild, clean bite and a pleasantly snappy texture that shines in fresh presentations, quick pickles, and vibrant garnishes. Grow it for its show-stopping color and satisfying crunch—an edible surprise that turns every harvest into a centerpiece.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 15th
Transplant / Sow Outdoors	May 15th
Harvest Begins	Jun 29th
Harvest Ends	Aug 25th

Crop Details

Trait	Value
Days to Maturity	45
Sun Requirements	Full Sun
Growth Habit	Taproot
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	40
Min Night Temp (°F)	28
Harden Off (days)	Not Required

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Frequently Asked Questions

What pest or disease most commonly hits Raphanus sativus (watermelon radish), and what can I do?

Cabbage loopers and aphids are common on Brassicaceae radishes, and downy mildew or powdery mildew can show up in humid weather. Check the underside of leaves every 2–3 days and hand-pick loopers; for infestations, spray insecticidal soap in the evening and repeat every 5–7 days as needed. For mildew, thin for airflow and water at soil level (not foliage), then remove heavily affected leaves to slow spread.

How often should I water watermelon radish during its main growing phase?

During the 3–5 weeks of root bulking, keep soil evenly moist but not soggy—aim for dampness in the top 2–3 in (5–7 cm) at all times. Water about 1 inch (2.5 cm) per week total, split into 2–3 sessions in hot weather, and reduce slightly if rain keeps the topsoil moist to prevent splitting or woody roots. Inconsistent moisture is a major trigger for pithiness in Raphanus sativus, so avoid letting the bed dry out between waterings.