Spirulina Growing Guide
Cyanobacterium (blue-green algae) cultivated in alkaline water for its exceptional nutritional profile — 60-70% protein by weight, rich in B-vitamins, iron, and antioxidants. A superfood crop.
Growing Conditions
Soil Requirements
Soil Type & pH
Best soil types: alkaline water, raceway ponds, photobioreactors
pH range: 8.5 - 11 (optimal: 10)
Drainage: poor
Nutrient Needs (N-P-K)
Planting Guide
Yield & Economics
Common Pests & Diseases
Common Pests
- rotifers
- amoeba
- competing algae
Common Diseases
- cyanophage infection
- bacterial contamination
- culture crash
Use to identify issues early and prevent crop losses.
Growing Tips
Maintain culture pH above 9.5 with sodium bicarbonate; the extreme alkalinity is spirulina's natural defense against contamination by other organisms.
Harvest daily by filtering 25-30% of the culture through fine mesh (40-50 micron); press and dry the biomass rapidly at below 65C to preserve nutrients.
Monitor culture density daily with a Secchi disc (8-12 cm reading is optimal); too dense = light limitation, too sparse = photoinhibition and contamination risk.
Frequently Asked Questions
How long does Spirulina take to grow?
Spirulina typically takes 14 days from planting to harvest. Seeds germinate in about 3 days. The best planting season is year-round.
What soil does Spirulina need?
Spirulina grows best in alkaline water, raceway ponds, photobioreactors soil with a pH of 8.5-11. Poor drainage is required.
What temperature does Spirulina need?
Spirulina grows best at 30-37°C. Frost tolerance: none. Heat tolerance: high.
What is the expected yield for Spirulina?
Spirulina yields approximately 30,000 kg dry biomass/hectare under good conditions. Multiple harvests per year are possible (12).
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