Photo: "Radish Microgreens (Raphanus sativus)" by Stacy Spensley
· CC BY 2.0
Rambo Radish Microgreens
Annual · Brassicaceae
Rambo Radish is grown for dark purple stems and cotyledons plus a spicy radish bite that arrives fast. It is one of the quickest microgreens, making it useful for beginners who want a colorful tray in under two weeks. Key facts: 6–10 days to maturity from seeding, 12+ hours of sun, 0" spacing. Container-friendly (minimum 1-gallon pot).
Updated June 1, 2026·Backed by 2 cited sources
Overview
At a Glance
The essentials first: timing, light, spacing, seed-starting, container fit, and overall size.
Days to maturity
6–10 days
from seeding
Sun
12+ hours
Bright Light 12-16 Hours Daily From Grow Lights Or A Very Bright Window
Spacing
0"
between plants
Seed start
0 weeks
before transplant
Container
Yes
1+ gallon pot
Height
0.1–0.2 ft
at maturity
Planting window
Zone Planting Guide
Switch zones to see whether this plant is a strong fit, what frost timing looks like, and any extra notes worth planning around.
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Care
Growing Guide
Everything in one place: seed starting, transplant timing, watering, soil, and structural support.
Seed starting
Germination
Time2–4 days
Optimal temperature70°F
Seed depth0.12"
Moisture
Watering
Weekly0.5–1"
NeedsConsistent
Base watering
Root zone
Soil
pH range6–7
PreferredFine, Clean, Seed Starting Or Microgreen Medium With Good Water Holding And Drainage.
Every answer is assembled from this cultivar's own record, so the figures match the rest of the page.
How many days to maturity for Rambo Radish Microgreens?
Rambo Radish Microgreens takes 6–10 days to reach maturity from sowing.
How far apart should you plant Rambo Radish Microgreens?
Space Rambo Radish Microgreens 0 inches apart, with 0 inches between rows.
How much sun do Rambo Radish Microgreens need?
Rambo Radish Microgreens needs at least 12 hours of direct sun a day.
How much water do Rambo Radish Microgreens need?
Rambo Radish Microgreens needs 0.5–1 inches of water a week, counting rainfall.
What soil pH do Rambo Radish Microgreens need?
Rambo Radish Microgreens grows best in soil with a pH of 6–7, ideally around 6.5.
How tall do Rambo Radish Microgreens get?
Rambo Radish Microgreens reaches 0.1–0.2 feet at maturity.
How do you start Rambo Radish Microgreens from seed?
Start seed indoors 0 weeks before your transplant date.
What temperature do Rambo Radish Microgreens seeds need to germinate?
Rambo Radish Microgreens seeds germinate best at 70°F, within a workable range of 65–75°F, and take 2–4 days to emerge.
Can you grow Rambo Radish Microgreens in containers?
Yes, Rambo Radish Microgreens grows well in containers. Use a pot of at least 1 gallons.
When is Rambo Radish Microgreens in season?
Rambo Radish Microgreens can be grown for most of the year in mild regions, and from spring through fall elsewhere. Plants reach harvest 6–10 days after sowing.
Resilience
Plant Health
Stress tolerance, resistance notes, and the most common problems to watch for as plants mature.
A seedling killer caused by several different fungi working together. It hits vegetables, flowers, herbs, microgreens, and cover-crop seedlings the same way — seeds rot before they emerge, or young seedlings collapse right at the soil line. Wet seed-starting mix and poor airflow in seedling trays are the classic conditions.
Triggers: Wet soil or starting mix, poor drainage, seedlings packed too tightly, contaminated trays or media, and stagnant air all favor damping-off.
On Rambo Radish Microgreens: Overwatering, poor airflow, and contaminated trays let seedling fungi kill stems at the soil line. The same damp, stagnant conditions also encourage harmless-looking surface mold on soaked seed hulls, which is easy to confuse with the real disease.
Prevention: Use clean trays and rinse seed well before sowing, bottom-water rather than overhead, avoid oversowing, and keep airflow moving — especially after germination — to keep both the fungus and the hull mold in check.
Risk fades when: Drying the soil surface and improving airflow slows new spread. Collapsed seedlings don't recover, but the rest of the tray can be saved.
Damping off of coffee seedlings caused by Fusarium sp. — Photo:
Scot Nelson
·
CC0 1.0
May, Jun, Sep, OctPeak window months: May, Jun, Sep, Oct.
Aphids are soft-bodied sap-sucking insects that cluster on tender new growth. Most established plants tolerate moderate populations and will outgrow damage on their own, but aphids are the most important plant virus vectors in the garden, transmitting more than 100 plant viruses including potato leafroll, cucumber mosaic, and turnip mosaic. Honeydew excreted while feeding supports sooty mold growth and attracts ants that protect aphids from natural enemies.
Triggers: Optimal development at ~75°F (green peach aphid) per UC IPM Floriculture; melon aphid develops fastest above 75°F. Many species heat-intolerant above 90°F and crash in mid-summer. Soft new growth and over-fertilization with high N favor population buildup. Females give live birth parthenogenetically most of growing season — one generation in ~1 week under optimal conditions.
Risk fades when: Per UC IPM and Clemson HGIC, populations crash in mid-summer heat (>90°F) for many species, return in cooler conditions
Aphis pomi (green apple aphid) colony on crab apple stem (resized, converted to WebP) — Photo:
InfluentialPoints
·
CC BY 3.0
Flea beetles are small (1/16-inch) shiny beetles that jump like fleas when disturbed. They chew small round 'shothole' or 'pinhole' damage in leaves and can destroy emerging cotyledons of broccoli or eggplant in 24 hours. Most species are host-family specific — crucifer flea beetle on brassicas, tuber flea beetle on potatoes, eggplant flea beetle on solanaceous crops.
Triggers: Overwinter as adults in leaf litter and field margins. Active at mid- to late-spring temperatures. Warm winter → higher next-spring populations (NC State). Hot dry conditions amplify damage on stressed seedlings.
Risk fades when: UMN: 1-2 generations in Minnesota, populations crash after mid-June
Crucifer flea beetle (Phyllotreta cruciferae) (cropped, resized, converted to WebP) — Photo:
AfroBrazilian
·
CC BY-SA 4.0
Feeding & picking
Nutrition & Harvest
How hungry the plant is, what ripe harvest looks like, and how long the crop keeps after picking.
Feeding
Nutrition
Feeding intensityNone feeder
Timing
Harvest
Harvest when stems are crisp, tops are upright, and flavor is at its best: stems are richly colored and cotyledons are open but still tender.
Expected yield0.1–0.3 lbs/plant
Storage5 days — Keep dry in a sealed container in the refrigerator with a paper towel to absorb moisture.
Stay in the loop
Planting reminders for Rambo Radish Microgreens
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What you'll need
Growing Supplies
Hand-picked for your Rambo Radish Microgreens, with the extension research behind every recommendation.
Mulch / landscape fabric
Nearly every garden benefits from mulch for weed suppression, moisture conservation, and soil temperature moderation. For most home gardeners, quality organic mulch is the better buy over landscape fabric.
Source: Penn State Extension; Wisconsin Horticulture; Illinois Extension
Every gardener benefits from putting water at the root zone instead of on the leaves, because drip and soaker systems reduce foliar disease pressure by limiting leaf wetness and soil splash. A quality kit should include a backflow preventer, filter, pressure reducer, and UV-resistant tubing.
Source: Iowa State University Extension; Colorado State University Extension; UMass Extension
Row cover adds frost protection, speeds early growth, and physically excludes insect pests without spraying. Look for spun-bonded fabric with a stated weight and frost rating, UV resistance, and enough width for hoops or low tunnels.
Source: University of Maryland Extension; University of New Hampshire Extension; Colorado State University Extension
K-State Research and Extension and University of Maryland Extension recommend shade cloth as a heat-management tool for vegetable gardens, with 30 percent shade rating most effective for tomatoes, peppers, and fruiting crops, and 40 to 50 percent for protecting heat-sensitive greens during hot summer months. University of Delaware research found 30 percent black shade cloth tripled marketable yield for bell peppers compared to unshaded plants, and Purdue trials showed shade cloth reduced maximum daily temperatures by 8 to 10 degrees Fahrenheit. Choose knitted polyethylene with reinforced grommets every 18 to 24 inches, mount on hoops or a frame with open sides for airflow, and remove or vent during prolonged wet weather to avoid increased humidity in the canopy.
Source: K-State Research and Extension; University of Maryland Extension; University of Delaware Cooperative Extension; Purdue University Extension
Reflective plastic mulch (white-on-black or silver)
North Carolina State Extension reports that white-on-black plastic mulch can reduce soil temperature by 5 to 20 degrees Fahrenheit and silver mulch by about 6 degrees, the opposite effect of black mulch which warms soil. This makes reflective mulch the appropriate plasticulture choice for hot zones (especially Zone 9a desert and other high-heat low-humidity areas) where overheating limits warm-season crop performance more than cold soil. Silver mulch adds documented aphid and thrips repellency from the reflective surface. Use only with drip irrigation installed underneath, never use plastic mulch without irrigation, and reserve for late spring or early fall plantings where the surrounding heat is the primary stress.
Source: North Carolina State Extension; University of Arizona Cooperative Extension
A soil test gives a baseline for pH and nutrient status so gardeners can add only what the soil actually needs. Prioritize a mail-in or lab-affiliated kit whenever possible because extension guidance notes that laboratory testing is more accurate than instant readers.
Source: University of Maryland Extension; Purdue Extension; Montana State University Extension
University of Minnesota Extension recommends measuring soil temperature 2 to 4 inches below the surface to decide when warm-season crops can actually be planted, because air temperature and average frost dates do not reliably predict whether soil is warm enough for germination. A dedicated soil thermometer with a 4 to 6 inch stainless steel probe gives gardeners a deterministic reading instead of relying on the calendar alone, which matters most in zones with wide last-frost variability. Look for a waterproof stainless steel stem, a clearly marked vegetable-garden temperature range, and a readable analog or digital display at planting depth.
University of Arizona Cooperative Extension notes that most vegetables root in the top 12 to 24 inches of soil and that hot, dry periods require more frequent irrigation, but watering by habit often wets only the top inch while leaving the root zone dry. A dedicated soil moisture meter with a long probe gives gardeners a deterministic reading at root depth instead of guessing from surface appearance, which is most critical in low-rainfall desert zones (Zone 9a Phoenix) and in raised beds or containers that dry from the top down. Look for a single-purpose moisture meter (not a 3-in-1 or 4-in-1 combo, which trade accuracy for feature count) with a probe that reaches 8 to 12 inches and a clear analog or digital display.
Source: University of Arizona Cooperative Extension
UF/IFAS Extension and Texas A&M AgriLife Extension recommend securing or removing trellises, shade cloth, hoop covers, container plants, and lightweight raised-bed accessories before tropical storms and hurricanes, since loose garden items become projectiles in high winds. Most-relevant for Gulf Coast Zone 8b (Houston, Mobile, New Orleans), Florida Zone 9b (Miami, Tampa), and any coastal area within the Atlantic and Gulf hurricane corridors. Galvanized steel ground anchors resist rust in humid coastal soils, and screw-in spiral anchors hold significantly better than driven stakes in saturated soil during storm conditions. Use quick-release fasteners on shade cloth and trellises so they can be removed quickly when a storm watch is issued.
Extension guidance favors bypass designs because they make cleaner, closer cuts on living tissue than anvil types. Look for hardened steel blades that can be sharpened, a comfortable grip, and a cutting capacity matched to real home-garden stems.
Source: University of New Hampshire Extension; Iowa State University Extension; Purdue University Extension
Raised beds improve drainage, let gardeners control soil from day one, reduce compaction, and make gardening more accessible. A quality kit should use rot-resistant, food-safe materials and provide enough depth for productive rooting.
Source: Penn State Extension; University of Delaware Cooperative Extension; Illinois Extension
The most useful mix is three categories: a beginner guide, a reference manual for diagnosis and crop-by-crop lookup, and a soil science book. Look for region-aware editions, strong visuals, and evidence-based authorship.
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Research
Sources
Reference material and extension guidance used to build this growing guide.
seed catalog True Leaf Marketuniversity Penn State Extension
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