Icicle

Radish

Zone 1a Save Garden

🌱 25d to harvest Rosette

Crisp as fresh-cut glass, ‘Icicle’ radishes unfurl into long, snowy-white roots with a cool, clean bite and a pleasantly mild, sw…

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Jun 15th
Transplant / Sow Outdoors	Jun 15th
Harvest Begins	Jul 10th
Harvest Ends	Jul 15th

Crop Details

Trait	Value
Days to Maturity	25
Sun Requirements	Full Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	40
Min Night Temp (°F)	32
Harden Off (days)	Not Required

Recommended Companions

Amsterdam Forcing Carrot

Red Amposta Onion

Frequently Asked Questions

What pests or diseases commonly hit Raphanus sativus (Icicle radish), and how can I fix them?

Watch for flea beetles and aphids, which can cause stippled leaves and stunted growth on radishes. Use row cover right after sowing and remove it when plants are established; if needed, spot-treat aphid pockets with insecticidal soap and rinse off afterward. For disease, keep foliage dry and avoid dense spacing to reduce downy mildew and leaf spots—discard badly infected leaves rather than composting them.

How often should I water Icicle radish during active root growth?

During the 20–25 day root-filling phase, keep the soil consistently evenly moist—typically about 1 inch (2–3 cm) of water per week total, split into lighter waterings as needed. Let the top 1 inch (2–3 cm) dry slightly between waterings, but don’t allow full drying, which leads to pithy, woody roots and bitterness. If the weather is hot or windy, check daily and water more frequently to maintain that steady moisture.

How do I know when Icicle radishes are ready to harvest?

Harvest at about 25 days (often 20–30 days depending on conditions) when roots are 1 inch (2–3 cm) long and crisp-looking, with a clear white, “icicle” shape above the soil line. Pull one early as a test—if the root feels firm and snap-crisp, harvest the rest immediately. Leaving radishes too long after they size up can cause them to become tough and may push flavor toward sharp/woody.

Crisp as fresh-cut glass, ‘Icicle’ radishes unfurl into long, snowy-white roots with a cool, clean bite and a pleasantly mild, sweet finish. The flesh stays tender and juicy at harvest, delivering a snappy crunch that shines in fresh salad mixes and bright garnishes. Grow ‘Icicle’ for quick, dependable results—ready in about 25 days—when you want a vivid, garden-to-plate crispness that looks as good as it tastes.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 32°F before moving outdoors.

Expert Note

For the mildest flavor, sow thinly and keep the soil consistently moist—radishes get spicy and pithy if stressed.