Sunflower Microgreens
Helianthus annuus
Overview
In an NFT system, sunflower microgreens require a grow mat (hemp, coco, or synthetic) placed in the channel to anchor roots. They are vigorous growers that consume significant water once established. The primary challenge in hydroponics is managing humidity to prevent mold while ensuring the hard seed hulls shed properly.
Growing Requirements
pH Range
6 - 6.5
EC Range
0.8 - 1.2 mS/cm
TDS Range
400 - 600 ppm
Temperature
20°C - 24°C
Light Requirement
High (16 hours/day)
Nutrient Needs
Growth Timeline
Soaking
8-12 hoursSoak seeds in cool water to soften the hard outer shell and trigger germination.
Germination (Blackout)
3-4 daysSpread seeds on the NFT mat. Cover and apply weight (weighted blackout) to force roots into the mat and help shed hulls. Keep moist but do not run continuous flow yet.
Greening
4-6 daysRemove weight and blackout cover. Turn on NFT flow (low flow rate) and expose to strong light to green up the cotyledons.
Common Issues & Solutions
Stuck Hulls
- Black seed shells clinging to leaves
- Deformed leaves
- Insufficient weight during blackout
- Low humidity during germination
- Mist frequently during early growth
- Lightly brush tops of greens to dislodge hulls
Mold/Fungus
- White spiderweb-like growth on mat
- Mushy stems
- Foul odor
- Poor airflow
- Seeding too densely
- Excessive humidity
- Increase fan circulation
- Sanitize seeds with hydrogen peroxide before soaking
- Reduce seed density
Harvesting Guide
When to Harvest
Harvest when cotyledons are fully expanded and flat, but before the 'true leaves' (small spiky leaves in the center) emerge, as these make the flavor bitter.
How to Harvest
Cut the stems just above the root mat using a sharp knife or scissors.
Storage Tips
Wash and spin dry thoroughly. Store in a sealed container with a paper towel to absorb moisture at 4°C.
Expected Yield
High (approx. 500g-800g per 10x20 inch area)
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