Fastest Growing Microgreens Ranked by Days to Harvest

Quick answer: Radish microgreens are the fastest variety you can grow, reaching harvest in as little as 6–8 days under good conditions (65–75°F, consistent moisture, proper airflow). Other common varieties range from 7–9 days up to several weeks, so knowing where each one lands helps you plan trays and keep a steady supply. Use this ranked list to match the right variety to your timeline.

Fastest Growing Microgreens Ranked by Days to Harvest

Radish microgreens can go from seed to harvest in as few as 6 days under the right conditions, which makes them one of the most useful crops for growers who need quick turnover.

That kind of speed matters whether you're growing at home and want fresh greens on the table fast, or you're managing multiple trays and trying to keep a steady supply going. Not every variety moves that quickly, though, and the numbers below assume reasonable conditions: consistent moisture, 65-75°F ambient temperature, and adequate airflow. In Milton and the broader North Atlanta area, summer humidity can push mold pressure up enough to slow some crops or kill them outright, so those conditions are worth keeping in mind as you read.

This list ranks common microgreen varieties from fastest to slowest by typical days to first harvest. Ranges reflect real variability, not best-case scenarios.

The Fastest: 6–9 Days to Harvest

1. Radish (6–8 days)

Radish is the benchmark for fast. Varieties like Daikon, China Rose, and Sango Purple germinate within 24–36 hours and push through the soil aggressively. At 70°F, most radish varieties hit a harvestable 2–3 inches within a week.

One thing worth knowing: Sango Purple radish produces a deeper color and slightly more peppery flavor than standard Daikon, but it can run a day slower. If you're choosing between them for speed alone, Daikon wins. For flavor and presentation, Sango is worth the extra day.

Seed density for radish runs higher than most crops — roughly 1.5 oz of seed per 10x20 tray is a reasonable starting point. Go much thinner and you'll get patchy coverage; go much thicker and you risk heat buildup at germination that invites damping off.

2. Mustard (7–9 days)

Mustard follows radish closely. It germinates fast, stands up well in warm conditions, and produces a sharp, spicy flavor that works well in sandwiches and grain bowls. Southern Giant Curled and Osaka Purple are two varieties worth trying if you can source them from a specialty seed supplier rather than a generic packet blend.

The leaves can get bitter if you let mustard go too long. Harvest on the early side, as soon as the cotyledons are fully open and before the first true leaves appear.

3. Arugula (7–9 days)

Arugula is fast but fussy about moisture. It needs consistent hydration without sitting wet — a balance that's harder to hit in Georgia summers when evaporation rates change with the air conditioning cycling on and off indoors. Bottom watering helps a lot here.

The Middle Range: 10–14 Days to Harvest

4. Broccoli (10–12 days)

Broccoli microgreens take about 10–12 days and are one of the more researched varieties for nutrient content. Studies have measured high concentrations of sulforaphane in broccoli sprouts and microgreens, though the levels vary based on seed source, harvest timing, and how you store them after cutting.

Speed-wise, broccoli is reliable but not exciting. Germination is steady at 65–70°F, and the plants don't need much fussing. If you're new to growing and want something forgiving in the 10-day range, broccoli is a good pick. See our microgreens growing basics page for more on setup.

5. Kale (10–13 days)

Kale runs slightly behind broccoli. Red Russian kale tends to develop faster and with better color than Lacinato at the microgreen stage, which surprises growers who expect the reverse. The flavor is mild enough to blend into almost anything.

6. Cabbage (10–13 days)

Similar timeline to kale. Red cabbage microgreens produce a nice purple color, but the flavor is fairly neutral. One honest limitation: cabbage microgreens wilt faster after harvest than most varieties. If you're growing for a farmers market (like the Milton Farmers Market at Birmingham Park), plan to harvest day-of rather than the night before.

7. Sunflower (10–14 days)

Sunflower is one of the more popular microgreens for good reason. The cotyledons are thick and crunchy, the flavor is mild and nutty, and they're filling enough to stand alone as a snack. But sunflower is a bit of a project.

You need to soak the seeds for 8–12 hours before planting. Un-hulled seeds require a weighted cover (called "blackout") for 3–4 days to push through the hull. Hulled seeds germinate more evenly but cost more and have a shorter shelf life. Neither approach is wrong; they're just different tradeoffs.

At 70–75°F, hulled sunflower seeds typically hit harvest around day 10–11. Un-hulled might take a day or two longer depending on how cleanly the hulls shed.

Seed density matters a lot with sunflower: around 2 oz per 10x20 tray for hulled seeds is a starting point, but you'll want to adjust after your first grow.

The Slower Growers: 14–21 Days to Harvest

8. Pea Shoots (14–18 days)

Pea shoots are worth the wait. The flavor is sweet, almost like fresh spring peas, and the texture holds up well in stir-fries where other microgreens would wilt immediately. They're also one of the larger-format microgreens, which makes them visually distinct on a plate.

That said, pea shoots don't perform well in high heat. Above 75°F, growth slows, the stems get stringy, and flavor suffers. In Milton, that means pea shoots are a fall-through-spring crop if you're growing in an unconditioned space. In a climate-controlled room they're year-round, but the summer heat management adds a real cost.

Soaking pea seeds for 8–12 hours before planting will knock a day or two off germination time. Speckled field peas and Dun peas both work well; Dun peas tend to produce a slightly sweeter shoot and are worth seeking out from specialty seed suppliers.

9. Cilantro (14–21 days)

Cilantro is legitimately slow, and a lot of beginners get discouraged by it. The seed (technically a fruit containing two seeds) needs to be cracked or soaked before planting, or germination will be uneven and slow. Even with proper prep, you're looking at 14–21 days, and the cotyledons don't look like much when they finally arrive.

It's not a crop for quick turnover. But if you enjoy cilantro and want the flavor at an intense concentration, it's worth a tray or two.

A Few Notes on What Actually Affects Speed

The day counts above are guidelines, not guarantees. Three factors move the numbers more than anything else:

Temperature. Most microgreens germinate fastest between 68–72°F. Below 60°F, germination slows significantly. Above 80°F, you start getting uneven germination and increased mold risk.

Seed quality. Old seed or seed stored in humid conditions can drop germination rates below 70%, which effectively extends your timeline because you're waiting on stragglers and filling gaps.

Water management. Overwatering is the most common mistake, and it slows growth by suffocating roots and inviting fungal problems. Bottom watering (pouring water into a second tray beneath the growing tray) keeps the medium moist without wetting the stems.

None of those are complicated, but they matter more than variety selection when something goes wrong. Before you start chasing faster varieties, it's worth making sure your basic setup is dialed in. The microgreens 101 page at Wind River Greens covers tray setup, watering methods, and light requirements if you want a foundation to work from.

If you want to start with the single fastest, most forgiving variety available, plant radish first. You'll have something on your plate within the week, and the grow will tell you more about your setup than any guide can.

Related guides

• Microgreens 101: Everything You Need to Know
• Explore All Microgreen Varieties (Plant Database)
• Recipe: Sunflower Microgreen Salad
• Recipe: Microgreen Pesto

The Middle Range and Slower Varieties: What to Expect from 10–21+ Days

Once you move past the 9-day mark, you're working with crops that require more patience but often deliver more complex flavor or higher yields per tray. These varieties are worth growing — they just need a different slot in your rotation planning.

Sunflower (10–14 days)

Sunflower microgreens are one of the most substantial crops you can grow. They're thick-stemmed, mildly nutty, and hold up well in salads without wilting immediately after cutting. Black oil sunflower seed is the standard variety — hull-on seed works fine, though you'll deal with shed hulls sticking to the cotyledons. Some growers soak seed for 8–12 hours before planting to speed germination. At 70°F with good soil contact and a weighted blackout period of 3–4 days, you can expect to see even, upright shoots ready to uncover by day 4 or 5, with harvest around day 10–12.

Seed density matters more with sunflower than almost any other crop. Too sparse and you get floppy, leggy stems that fall over before harvest. A single layer of seeds touching but not stacked — roughly 2 oz per 10x20 tray — is the right density for structural support.

Peas (12–16 days)

Speckled Pea and Dun Pea are the most common varieties used for microgreens. Both need soaking — 8 to 12 hours in cool water is standard — and they benefit from a longer blackout period than most crops, often 5–6 days. The shoots are sweet, tender, and thick enough to use as a garnish or eat in volume. One limitation in warm climates: peas do not love heat. Above 75°F they slow down noticeably, and above 80°F germination gets patchy. If you're growing in a climate-controlled space in summer, keep the tray temperature in check or save this crop for fall and winter.

Broccoli (10–14 days)

Broccoli microgreens are popular because of their mild flavor and the research attention they've received around sulforaphane content. From a grower's standpoint, they're straightforward — medium germination speed, no soaking needed, and consistent enough that they're a reliable filler crop in any rotation. Calabrese is the variety most seed suppliers stock for microgreen use. Expect germination in 2–3 days and cotyledons open by day 7–8, with harvest ready between day 10 and 14 depending on temperature.

Cabbage (10–14 days)

Red Acre Cabbage microgreens run on a similar timeline to broccoli and are worth growing if you want color on the plate. The stems hold a deep reddish-purple that adds visual contrast without affecting flavor significantly. Like most brassicas, cabbage microgreens need airflow — stack trays too tightly in germination and you'll see damping off move fast.

Wheatgrass and Buckwheat (14–21 days)

Both of these sit at the slow end of the common microgreen spectrum. Hard Red Winter Wheat is the standard variety for wheatgrass, and it needs a soak plus a long blackout period before it'll stand up straight. Buckwheat — specifically the unhulled variety — can be tricky because the hull holds moisture and invites mold if airflow isn't sufficient. Both crops have a loyal following, but neither is the right choice if you're trying to keep fast inventory moving.

Tray Scheduling: How to Keep a Steady Supply Using This List

Knowing the days-to-harvest for each variety is only useful if you connect that number to a planting schedule. The goal for most home growers and small operations is continuous harvest — meaning you're never waiting weeks between cuts and never drowning in greens all at once.

The simplest method is staggered seeding by days-to-harvest. If radish takes 7 days and peas take 14, seeding one radish tray every 3–4 days keeps a weekly supply moving. Adding a pea tray every week on a set day keeps that crop cycling without overcomplicating the calendar.

A few practical notes on building this schedule:

• Group crops by harvest window, not by seed date. A radish tray seeded Monday and a mustard tray seeded Tuesday will likely harvest within a day of each other. Treat them as the same harvest event to reduce cutting and refrigerating in too many small batches.
• Build in buffer days. Real grow times vary. A cool overnight, a missed watering, or a stretch of dry indoor air can push harvest back by 1–2 days. Plan for that rather than cutting on a rigid calendar date.
• Track actual days, not projected days. Keep a simple log — seed variety, date seeded, date harvested, any notes on conditions. After 4–6 rounds you'll have accurate numbers specific to your space, which beats any generic chart including this one.
• Harvest at the right stage, not at the target day count. Days-to-harvest figures are a starting point. The actual signal to cut is visual: cotyledons fully open, color saturated, stems upright. A broccoli tray at day 12 that still looks pale and weak isn't ready. A radish tray at day 7 that's at 3 inches and fully colored is.

For growers in the North Atlanta area managing humidity swings, it's worth keeping faster-cycling crops like radish and mustard as your backbone and treating slower crops like peas and sunflower as supplemental. The faster varieties give you the most flexibility to respond to what's actually happening in your grow space week to week.

Equipment and Materials That Actually Affect Harvest Timing

The variety you plant sets the ceiling on how fast you can harvest. Everything else — trays, growing medium, light source, watering method — determines whether you hit that ceiling or fall short of it.

Growing Medium

Coconut coir is the most widely used soilless medium for microgreens, and it works well for most varieties at a depth of about 1 to 1.25 inches. It drains well, holds enough moisture between waterings, and doesn't compact the way some potting mixes do. Hemp grow mats are a faster-setup alternative — no measuring, no mess — and they work particularly well for smaller-seeded crops like arugula and broccoli. The tradeoff is cost. At scale, coir is considerably cheaper per tray. For home growers running 4–8 trays, mats may be worth it for the simplicity.

Avoid standard potting mix with fertilizer added. It's unnecessary for microgreens at the cotyledon stage, and high-nitrogen mixes can cause problems with fast-growing brassicas in particular.

Light

After the blackout germination period, microgreens need consistent light to develop stem strength and color. A weak light source or trays placed too far from a window will produce pale, leggy growth that stretches toward the source — and that stretching adds days to harvest while producing a weaker end product. A dedicated LED grow light positioned 2–4 inches above the canopy for 12–16 hours per day is more reliable than window light in most home setups. T5 fluorescent fixtures also work well and are often cheaper to source used. The goal is consistent intensity, not any particular spectrum technology.

Airflow

A small oscillating fan running on low — not pointed directly at trays, but moving air in the same room — reduces mold pressure and strengthens stems. This matters most for dense crops like sunflower and for any tray grown in high humidity. In Georgia summers, skipping airflow on a sunflower tray is how you end up with white fuzz at the base by day 6.

Watering Method

Bottom watering — pouring water into a tray beneath the grow tray and letting the medium wick it up — keeps the surface drier and reduces damping off risk on susceptible varieties like arugula and basil. Top misting works fine for hardier crops like radish and sunflower. If you're only going to pick one method, bottom watering is the more forgiving default across the widest range of crops.