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🔍 Click to enlargevegetableannual💧 Hydroponic-Compatible
Radish
Raphanus sativus
One of the fastest vegetables to harvest. Perfect for impatient gardeners.
Quick Facts
Sun:☀️ Full Sun, ⛅ Partial Shade
Water:💧💧 Moderate
USDA Zones:Zones 3–11
Space:🪴 Container, 🌱 Small Bed, 🏡 Large Garden
Soil:Sandy, Loam, Silty
Best Season(s):Spring, Fall
Experience Level:🌱 Beginner
Native Range:Southeast Asia
Bloom Color:White to lavender if bolted (grown for root)
Bloom Cycle:Bolts quickly in heat — a sign the crop is finishing
Days to Harvest:22–30 days
Harvest Pattern:Single harvest per planting
Care Notes
Sow every 2 weeks for continuous harvest. Bolts quickly in heat.
💧 Hydroponic Notes
Fast results in Kratky or DWC. Use a deep net cup for root development. Harvest promptly to avoid woody texture.
Growing Details
Mature Size:6-12 in tall, 4-6 in wide (root 1-2 in diameter for globe types)
Growth Rate:🐇 Fast
Zone Performance
At the cold edge (zone 3-4), radish is strictly a short-window spring and late-summer crop sown as soon as soil can be worked, since it needs consistently cool soil to avoid pithy roots. At the warm edge (zone 9-11), spring windows close fast once daytime temps exceed 75°F and bolting accelerates, so growers there rely mainly on a long fall-through-winter growing season instead.
Companions & Wildlife
🦌 Deer Resistance
seldom damaged
The pungent, mustard-oil foliage is generally unappealing to deer, though hungry animals may nibble tops in early spring.
🐝 Pollinator Value
low
Rarely flowers under normal harvest timing, but bolted plants left in the ground produce small white-purple flowers that draw hoverflies and small native bees.
Good Companions
Cucumber — Radish is a classic trap crop for cucumber beetles, drawing pest pressure away from the cucumber.
Spinach — Fast-growing radish is a compatible, non-competing filler crop between slower-growing spinach.
Troubleshooting
⚠️ Roots stay small or fail to bulb
Thin seedlings to 1-2 inches apart early — overcrowding is the single most common cause of skinny, misshapen roots.
⚠️ Bolting to flower before roots size up
Sow in cool weather only (spring or fall) and keep soil consistently moist; heat and drought stress both trigger premature bolting.
⚠️ Flea beetle shot-hole damage on leaves
Cover rows with lightweight row cover immediately after sowing, since radish germinates and matures fast enough to often outrun light infestations.
💧 Growing Radish Hydroponically
Radish is well suited to soil-free growing. Here is what to know before you set up.
Time to harvest
22–30 days
Target pH
5.5 – 6.5
General hydroponic range — see the notes below for anything specific to this plant.
We don't list a nutrient-strength or light target for Radish, because we don't have a reliable range for it. Start with your nutrient's label and adjust by watching the plants.
Fast results in Kratky or DWC. Use a deep net cup for root development. Harvest promptly to avoid woody texture.
✅ Pet Safety
Non-toxic to cats and dogs.
Informational only — always check with a veterinarian if you suspect your pet has eaten something it shouldn't have.