Broccoli Microgreens
Brassica oleracea var. italica
Overview
In an NFT (Nutrient Film Technique) system, broccoli microgreens are typically grown on a hydroponic medium (such as hemp, coco coir, or biostrate mats) placed within the channels. They are robust and forgiving, making them ideal for beginners. The constant flow of nutrient-rich water in the NFT system accelerates growth compared to soil, but care must be taken to ensure the medium remains moist without becoming waterlogged to prevent mold issues.
Growing Requirements
pH Range
5.5 - 6.5
EC Range
0.8 - 1.2 mS/cm
TDS Range
400 - 600 ppm
Temperature
18°C - 24°C
Light Requirement
Medium (14 hours/day)
Nutrient Needs
Growth Timeline
Germination (Blackout)
3-4 daysSeeds are sown densely on the medium and kept in total darkness with high humidity to encourage sprouting. In an NFT system, the pump is usually off or set to a very low intermittent flow during this phase to prevent washing seeds away.
Greening
1-2 daysTrays are exposed to light. The yellow sprouts turn green (photosynthesis begins). The NFT pump is turned on to a regular cycle to provide constant hydration.
Vegetative Growth
5-8 daysRapid stem elongation and leaf expansion occurs. Roots grow through the medium into the nutrient film. Maintain good airflow to prevent mold.
Common Issues & Solutions
Damping Off / Mold
- White fuzzy growth on roots/stems
- Mushy stems at the base
- Patches of collapsing plants
- Excessive humidity
- Poor airflow
- Water level in NFT channel too high (soaking the stem)
- Increase air circulation with fans
- Reduce watering frequency or flow rate
- Spray with dilute food-grade hydrogen peroxide
Leggy Stems
- Tall, weak stems
- Plants falling over
- Insufficient light intensity
- Lights positioned too far from the crop
- Lower grow lights closer to the canopy
- Increase light duration
Harvesting Guide
When to Harvest
Harvest when the cotyledons (seed leaves) are fully open and green, and the first true leaves are just beginning to emerge (usually days 10-14).
How to Harvest
Use a sharp knife or scissors to cut the stems just above the grow medium. Avoid pulling, as this may bring up substrate or roots.
Storage Tips
Ensure greens are dry before storing. Place in an airtight container with a paper towel to absorb excess moisture and refrigerate immediately.
Expected Yield
High; approximately 200g to 300g per standard 1020 tray equivalent.
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