How Long Does It Take to Grow Microgreens by Variety: Complete Timeline Guide

Quick answer: Microgreens can be ready to harvest in as little as 5 days or up to 16 days, depending on the variety you're growing. Fast growers like radish and cress are ready in 5-8 days, while others take more time to reach peak flavor and nutrition. Knowing each variety's timeline helps you plan successive plantings so you always have fresh greens ready to harvest.

Growing microgreens is one of the most rewarding ways to get fresh, nutritious greens on your table quickly. But timing is everything when it comes to harvesting these tiny powerhouses at their peak flavor and nutrition.

Different microgreen varieties have vastly different growing timelines, ranging from lightning-fast 5-day crops to more patient 16-day varieties. Understanding these timelines helps you plan successive plantings, manage multiple varieties, and ensure you're harvesting at the optimal moment for maximum flavor and nutrition.

Fast-Growing Microgreens (5-8 Days)

Radish Microgreens: 5-7 Days

Radish microgreens are the speed demons of the microgreen world. These spicy little gems are typically ready for harvest in just 5-7 days from seed to plate.

The cotyledons (seed leaves) emerge around day 3, and by day 5, they're already developing their characteristic peppery bite. For maximum spice, harvest on day 6-7 when the leaves are fully opened but before the first true leaves appear.

Common radish varieties like Cherry Belle and Daikon follow this timeline closely, though Daikon tends to be slightly milder and may benefit from an extra day of growth.

Cress Microgreens: 6-8 Days

Watercress and garden cress are nearly as speedy as radishes. These peppery microgreens germinate quickly and develop their distinctive tangy flavor by day 6.

Cress microgreens have a unique growing pattern - they tend to grow in dense, carpet-like mats that are perfect for cutting with scissors. Harvest when the cotyledons are fully expanded and bright green, usually around day 7-8.

Mustard Microgreens: 6-8 Days

Mustard microgreens bring serious heat in a short timeframe. Red Giant and Mizuna varieties are typically ready in 6-8 days.

These microgreens develop their spicy kick early, so if you prefer milder flavors, harvest closer to day 6. For those who love bold, wasabi-like heat, let them go the full 8 days.

Medium-Growing Microgreens (8-12 Days)

Broccoli Microgreens: 8-10 Days

Broccoli microgreens are among the most popular varieties, and for good reason. These nutritional powerhouses are ready in 8-10 days and pack incredible health benefits.

Germination typically occurs within 2-3 days, with cotyledons emerging by day 4-5. The optimal harvest window is day 8-10, when the cotyledons are fully developed but before the first true leaves become prominent.

Broccoli microgreens have a mild, slightly sweet flavor with just a hint of that classic broccoli taste. They're perfect for beginners and experienced growers alike.

Kale Microgreens: 8-12 Days

Kale microgreens take a bit longer than their cruciferous cousin broccoli, typically requiring 8-12 days for optimal harvest. The timeline can vary significantly based on the specific kale variety.

Curly kale varieties tend to be ready closer to day 8-10, while Red Russian and Lacinato (dinosaur) kale may need the full 12 days. The cotyledons should be well-developed and the stems sturdy before harvesting.

These microgreens offer the nutritional benefits of full-grown kale in a more tender, milder package.

Arugula Microgreens: 9-12 Days

Arugula microgreens develop their signature peppery flavor gradually over 9-12 days. Early harvest at day 9 yields milder greens, while waiting until day 12 produces more intense, spicy flavors.

These microgreens have distinctive lobed cotyledons that make them easily recognizable. They're perfect for adding a peppery kick to salads and sandwiches.

Cabbage Microgreens: 9-12 Days

Red and green cabbage microgreens follow a similar 9-12 day timeline. Red cabbage varieties often take slightly longer but reward patience with stunning purple and red coloration.

The flavor is mild and slightly sweet, making cabbage microgreens excellent for those new to growing or eating microgreens. They're also visually striking, especially the red varieties.

Slower-Growing Microgreens (12-16 Days)

Pea Shoot Microgreens: 12-14 Days

Pea shoots are technically different from traditional microgreens since you're growing them for their shoots and tendrils rather than just cotyledons. This longer growing period results in a more substantial, crunchy texture.

These sweet, fresh-tasting greens are worth the wait. Harvest when the shoots are 3-4 inches tall with well-developed leaves and tendrils. The flavor is unmistakably sweet pea, making them a favorite for both chefs and home growers.

At Wind River Greens, pea shoots are consistently one of our most popular varieties due to their incredible flavor and substantial texture.

Sunflower Microgreens: 12-16 Days

Sunflower microgreens are the giants of the microgreen world, requiring 12-16 days to reach optimal harvest size. These substantial microgreens have thick, meaty cotyledons and sturdy stems.

The longer growing period allows sunflower microgreens to develop complex, nutty flavors. They're incredibly satisfying to eat and add substantial texture to any dish.

Black oil sunflower seeds are typically used for microgreen production and require hulled seeds for best results. The shells must be removed, or they'll create mold issues during the longer growing period.

Beet Microgreens: 12-15 Days

Beet microgreens, with their stunning red and green coloration, take 12-15 days to fully develop. The longer timeline allows the characteristic red veining and stems to develop fully.

Both the cotyledons and the first true leaves are edible and delicious. The flavor is mild and slightly earthy, with none of the sometimes overpowering earthiness of mature beets.

These colorful microgreens are as beautiful as they are nutritious, making them perfect for garnishing and adding visual interest to dishes.

Chard Microgreens: 14-16 Days

Rainbow chard microgreens are among the slowest-growing common varieties, requiring 14-16 days for optimal harvest. The wait is worth it for the spectacular array of colors - red, yellow, orange, and pink stems topped with green leaves.

The longer growing period allows the stems to develop their full coloration and the leaves to become more substantial. Harvest when the cotyledons are fully expanded and the first true leaves are just beginning to emerge.

Factors That Affect Growing Times

Temperature Control

Temperature is the single most important factor affecting microgreen growing speed. Most microgreens prefer temperatures between 65-75°F for optimal growth.

Higher temperatures generally speed up growth but can also lead to leggy, weak plants and increased disease pressure. Lower temperatures slow growth but often produce more flavorful, substantial microgreens.

Maintaining consistent temperatures throughout the growing cycle ensures predictable harvest timing and better quality crops.

Light Exposure

Proper lighting dramatically affects both growth speed and quality. Microgreens need adequate light once their cotyledons emerge to develop properly and avoid becoming leggy and pale.

LED grow lights providing 12-16 hours of daily illumination typically produce the fastest, most robust growth. Natural sunlight works well too, but can be less consistent and harder to control.

Insufficient light extends growing times and produces weaker, less flavorful microgreens.

Humidity and Airflow

Proper humidity levels (40-60%) and gentle airflow help microgreens grow at optimal speeds while preventing mold and disease issues.

Too much humidity slows growth and encourages mold, while too little can stress plants and extend growing times. Good air circulation helps maintain ideal growing conditions and promotes healthy, timely growth.

Optimizing Your Harvest Timing

Visual Cues for Harvest Readiness

Learning to read visual cues helps you harvest at the perfect moment regardless of the calendar. Look for fully expanded cotyledons with good color and sturdy stems.

Most microgreens are ready when the cotyledons are fully opened and the first true leaves are just beginning to emerge. Harvesting before true leaf development ensures the best texture and flavor concentration.

Avoid waiting too long, as microgreens become tougher and less flavorful once they begin putting energy into true leaf development.

Successive Planting Strategies

Understanding growing timelines allows you to plan successive plantings for continuous harvests. Start new trays every 3-4 days for fast varieties or every week for slower ones.

This approach ensures you always have fresh microgreens ready for harvest while avoiding the feast-or-famine cycle that many beginners experience.

Keep detailed records of planting dates and varieties to perfect your timing and predict harvest dates accurately.

Storage and Shelf Life Considerations

Harvest timing also affects storage life. Microgreens harvested at their peak maintain quality longer than those harvested too early or late.

Most properly harvested microgreens stay fresh for 7-10 days when stored correctly in the refrigerator. This knowledge helps you time plantings to match your consumption patterns.

Common Timing Mistakes to Avoid

Harvesting Too Early

The most common mistake beginners make is harvesting too early, often due to excitement or impatience. Microgreens harvested before their cotyledons are fully developed lack flavor and nutrition.

Wait for the cotyledons to fully expand and develop their characteristic color. This patience pays off with more flavorful, nutritious harvests.

Waiting Too Long

On the flip side, waiting too long results in tough, bitter microgreens with reduced nutritional value. Once true leaves begin developing significantly, the eating quality rapidly declines.

Most varieties have a 2-3 day optimal harvest window. Learn to recognize this window for each variety you grow.

Growing microgreens successfully is all about timing, and understanding the specific timeline for each variety sets you up for consistent success. Whether you're growing lightning-fast radishes or taking your time with beautiful sunflower microgreens, knowing what to expect helps you plan better and harvest at peak quality.

Remember that these timelines are guidelines - your specific growing conditions will influence actual harvest dates. Keep detailed records, observe your plants closely, and adjust your expectations based on your unique setup. With experience, you'll develop an intuitive sense for when each variety is ready for that perfect harvest.

If you found this useful

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

Slower-Growing Microgreens (12-16 Days)

Sunflower Microgreens: 10-14 Days

Sunflower microgreens take more patience than most varieties, but the payoff is worth it. These thick, crunchy greens need 10-14 days from seed to harvest, with germination typically happening around day 3-4. One key step that speeds things up: soak sunflower seeds for 8-12 hours before planting. Skipping the soak can add 2-3 days to your timeline and lead to uneven germination.

Harvest when the hulls have mostly dropped from the leaves and the cotyledons are fully open and deep green. If you harvest too early while the seed hulls are still clinging, the texture suffers and flavor is underdeveloped. Black Oil Sunflower seeds are the standard choice here — they germinate more reliably than striped varieties.

Pea Shoots: 12-16 Days

Pea shoots are among the slowest microgreens you'll grow, but they also produce one of the most substantial harvests. Speckled Pea and Dwarf Grey Sugar varieties both land in the 12-16 day window. Like sunflowers, peas benefit from soaking — 8 hours is usually enough to soften the seed coat and shave 1-2 days off germination time.

By day 6-7, you'll see the shoots pushing upward with tendrils starting to curl. Harvest at 3-4 inches tall, before the tendrils get too long and stringy. The flavor is sweet and fresh — similar to fresh garden peas — and the texture is tender but with a satisfying bite.

Amaranth Microgreens: 10-14 Days

Amaranth is a slower grower that rewards close attention. It germinates in 3-4 days but grows at a deliberate pace after that. Harvest around day 12-14 when the cotyledons show their characteristic deep red and green coloring. One thing to know: amaranth seeds are tiny, and overseeding is a common mistake. Use roughly 1 ounce per 10x20 tray. Too dense, and air circulation drops, which increases the risk of damping off during the longer grow window.

When Timelines Go Wrong: Common Causes of Delayed Growth

Even with a reliable schedule, microgreens don't always follow the plan. Here are the most common reasons a crop runs behind — and what to do about it.

• Temperature too low: Most microgreens grow best between 65-75°F. At 60°F, you can expect germination and growth to slow by 20-30%. Radishes and mustard are forgiving, but broccoli and kale will stall noticeably below 62°F.
• Insufficient light after germination: Once you remove the blackout dome, microgreens need 12-16 hours of light per day. Without enough light, plants stretch toward the source, stems become weak, and the crop lags behind schedule by 2-4 days.
• Uneven watering: Bottom watering is more consistent than top watering once seeds have germinated. Dry pockets in the tray slow growth unevenly, so you end up with a mixed harvest window instead of a clean cut-and-done day.
• Old or low-germination seeds: Seed viability drops over time. If you're using seeds more than two years old, do a germination test before planting a full tray. Low germination rates throw off density, which throws off timing.

Planning Successive Plantings Around These Timelines

Once you know how long each variety takes, you can work backward from when you want to harvest. If you want fresh broccoli microgreens every week, start a new tray every 8-10 days. For pea shoots, stagger plantings every 12-14 days.

A simple approach: keep a small whiteboard or notebook with each tray's plant date and expected harvest date. When you're running 3-4 varieties at once, it's easy to lose track. Mixing fast growers like radish with slower crops like sunflower means you're harvesting something almost every 2-3 days without a large time investment upfront.

Grouping varieties by similar timelines also simplifies tray management. Broccoli, kale, and kohlrabi all fall in the 8-12 day window and handle similar growing conditions — same temperature range, same light schedule, same watering routine. Running these together keeps your setup efficient.