Watermelon Radish

Family: Brassicaceae Root Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add Watermelon Radish to a garden.

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.

Light: Full SunMaturity: 45 DaysHabit: Taproot

Botanical illustration of Watermelon Radish

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Watermelon Radish Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Direct Sow	Jun 1st	Jul 16th – Aug 1st
Zone 2a	Direct Sow	May 25th	Jul 9th – Aug 29th
Zone 2b	Direct Sow	May 15th	Jun 29th – Aug 25th
Zone 3a	Direct Sow	May 15th	Jun 29th – Sep 1st
Zone 3b	Direct Sow	May 19th	Jul 3rd – Sep 21st
Zone 4a	Direct Sow	May 15th	Jun 29th – Sep 24th
Zone 4b	Direct Sow	May 13th	Jun 27th – Sep 27th
Zone 5a	Direct Sow	May 8th	Jun 22nd – Sep 30th
Zone 5b	Direct Sow	May 4th	Jun 18th – Oct 5th
Zone 6a	Direct Sow	May 1st	Jun 15th – Oct 10th
Zone 6b	Direct Sow	Apr 25th	Jun 9th – Oct 16th
Zone 7a	Direct Sow	Apr 20th	Jun 4th – Oct 20th
Zone 7b	Direct Sow	Apr 10th	May 25th – Oct 28th
Zone 8a	Direct Sow	Apr 1st	May 16th – Nov 5th
Zone 8b	Direct Sow	Mar 23rd	May 7th – Nov 12th
Zone 9a	Direct Sow	Mar 6th	Apr 20th – Nov 26th
Zone 9b	Direct Sow	Feb 9th	Mar 26th – Dec 9th
Zone 10a	—	Oct 1st	Nov 15th – Feb 28th
Zone 10b	—	Oct 1st	Nov 15th – Feb 28th
Zone 11a	—	Oct 1st	Nov 15th – Feb 28th
Zone 11b	—	Oct 1st	Nov 15th – Feb 28th
Zone 12a	—	Oct 1st	Nov 15th – Feb 28th
Zone 12b	—	Oct 1st	Nov 15th – Feb 28th
Zone 13a	—	Oct 1st	Nov 15th – Feb 28th
Zone 13b	—	Oct 1st	Nov 15th – Feb 28th

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

Culinary Notes

Chef's Note

Watermelon Radish is built for contrast: it brings a mild radish snap and a pool of crisp juice, so it stays lively under quick acid treatments rather than turning sharp or hollow. Slice it thin and cold for maximum crunch—or pickle fast to lock in that rosy blush while keeping the bite clean.

Best Uses

paper-thin slices for cold crunch on composed plates
quick pickles (vinegar-sugar) to keep the snap and color
ice-cold radish garnishes that cut through rich proteins
radish “chips” or rosettes for a showy, snappy texture

Flavor Profile

mild, clean radish bite juicy, watery crunch subtle peppery snap with a bright finish

Kitchen Pairings

lime feta black pepper soy sauce chili oil butter

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.

How do I tell when watermelon radish is ready to harvest?

Harvest at about 45 days from sowing, when the roots are fully enlarged and the outside skin looks firm and well-colored. Use gentle pressure at the soil line—if the bulb feels solid and about the expected size for your seed packet, pull a test radish and cut it open to confirm the crisp, vividly colored flesh. If left too long, Raphanus sativus can become pithy and hotter in flavor.