Microgreens are usually ready to harvest within 7–21 days depending on the variety, seed type, and growing conditions. Most are harvested when the first true leaves appear, typically 1.5–3 inches tall.
Why Understanding the Harvest Timeline Matters
Knowing the correct harvest time for microgreens is essential for maximum flavor, nutrition, and yield. Harvesting too early may reduce growth potential and nutrients, while harvesting too late can result in tough stems and bitter leaves. The timeline varies for each variety, growing method, and indoor conditions such as light, temperature, and humidity.
Harvest timing also affects the marketability of microgreens for commercial growers. Freshly harvested microgreens retain more vitamins, antioxidants, and flavor compared to older or overgrown greens. For home growers, a clear harvest schedule ensures a continuous, fresh supply for juices, salads, and recipes.
Typical Harvest Timelines for Popular Microgreens
- Radish: 7–10 days, 1.5–2 inches tall
- Broccoli: 10–14 days, 2–3 inches tall
- Sunflower: 10–12 days, 3–4 inches tall
- Pea Shoots: 12–21 days, 3–4 inches tall
- Mustard: 8–12 days, 2–3 inches tall
- Arugula: 10–15 days, 2–3 inches tall
These timelines assume optimal growing conditions including proper soil, moisture, and lighting. Deviations in temperature or watering can speed up or slow down growth.
Signs Microgreens Are Ready to Harvest
- True Leaves Appear: The first set of true leaves is a reliable sign for most varieties.
- Height: Usually 1.5–3 inches tall depending on variety.
- Color: Vibrant green indicates peak nutrient content.
- Stem Strength: Sturdy stems that support leaves without bending excessively.
Harvesting at this stage ensures maximum flavor and nutrient retention.
Day-Wise Growth Observations
Day 1–3: Seeds germinate; tiny sprouts emerge. Maintain moist soil and dark conditions if required.
Day 4–7: Cotyledons (seed leaves) appear. Continue misting and provide indirect light or LED lighting.
Day 8–14: True leaves start developing. Microgreens grow rapidly. Monitor soil moisture and airflow to prevent mold.
Day 15–21: Peak harvest window for larger varieties like pea shoots and sunflower. Microgreens are vibrant and nutritious.
Adjust based on variety and growing conditions; smaller seeds mature faster while larger seeds take longer.
Factors Affecting Harvest Time
- Light: Adequate sunlight or LED light accelerates growth. Insufficient light causes leggy or slow growth.
- Temperature: Ideal indoor temperature is 18–24°C. Extreme cold slows growth, while excessive heat can stress seedlings.
- Watering: Consistent moisture is key. Overwatering causes mold; underwatering slows growth.
- Seed Quality: Fresh, high-quality seeds germinate faster and produce uniform growth.
How to Harvest Microgreens Properly
- Use clean scissors or a sharp knife.
- Cut just above the soil line to avoid root contamination.
- Harvest early in the morning for maximum nutrient retention.
- Rinse gently if needed and consume immediately or store in airtight containers in the fridge for 3–5 days.
Proper harvesting ensures that microgreens remain fresh, flavorful, and safe to eat.
Tips for Staggered Harvest
- Sow new trays every few days for a continuous harvest.
- Rotate varieties to always have ready-to-harvest microgreens.
- Monitor each tray individually as growth rates vary even under identical conditions.
Troubleshooting Common Harvest Issues
- Leggy Microgreens: Increase light intensity or move LED lights closer.
- Yellowing Leaves: Could be nutrient deficiency or inconsistent watering.
- Mold on Soil Surface: Harvest immediately, reduce moisture, and improve airflow.
- Overgrown Microgreens: Leaves may become bitter; cut them quickly and adjust sowing schedule.
Frequently Asked Questions
Q1: When is the best time of day to harvest microgreens?
Early morning is ideal when moisture content is high and nutrients are at peak.
Q2: Can I harvest microgreens multiple times from the same tray?
Most microgreens are harvested once. Some hardy varieties like pea shoots can regrow if roots remain intact.
Q3: How do I know if microgreens are overripe?
Leaves may yellow, stems become tough, and flavor may turn bitter.
Q4: Should I wash microgreens before storage?
Yes, gently rinse and pat dry before storing in airtight containers.
Q5: How long do harvested microgreens stay fresh?
Typically 3–5 days in the refrigerator. Consume as soon as possible for maximum nutrition.
Final Thoughts
Understanding the harvest timeline is critical for maximizing flavor, nutrition, and yield. By observing growth stages, monitoring light, moisture, and temperature, and harvesting at the right height, microgreens can be enjoyed at their peak. Staggered sowing and careful attention to each tray ensure a continuous supply of fresh, vibrant, and healthy microgreens year-round.