Description
Spinacia oleracea is a fast-growing, leafy annual vegetable cultivated for its nutritious green leaves. It grows in a compact rosette, typically reaching 20 to 30 cm tall, with smooth or crinkled dark green leaves depending on the variety.
Spinach thrives in cool climates and fertile, well-drained soil rich in organic matter. It prefers full sun to partial shade and can tolerate light frost. The plant bolts quickly in hot weather, so it is often grown in spring or autumn.
Highly valued as a versatile and nutrient-rich crop, spinach is widely grown worldwide for fresh use in salads, cooking, and juicing.
Germination Guide
🌍 Central and Western Asia, Southwest Siberia
Moderate
Spinacia oleracea is a cool-season leafy vegetable native to Central and Western Asia. Spinach seeds have a pericarp that inhibits germination, particularly at higher temperatures. Pre-treatment and proper temperature management are critical for successful seed germination.
Germination
Germination time
Expect germination in
5 – 14 days
Temperature
Min 2°C
Ideal 20°C
Max 30°C
Substrate moisture
💧 Medium
Seed Pre-treatment
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💧
Soaking — 6 hours
Cold water soaking in refrigerator for 24 hours or lukewarm water for 6-8 hours can improve germination. Leaching at 10-20°C temperature optimal.
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🔨
Mechanical scarification
Mechanical scarification to crack-open the pericarp increases germination uniformity. Acid scarification with H2SO4 also effective. Methods include nicking with sharp objects or hydrogen peroxide soaking.
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📋
Additional notes
Seed priming with PEG-6000 at controlled osmotic potential (-1.3 MPa) for one week at 10°C significantly improves germination at supraoptimal temperatures. Fresh seeds recommended as germination rates deteriorate rapidly.
Substrate & Container
Recommended substrate
Well-drained soil with high organic matter, neutral pH 6.0-8.0
Recommended container
Seed starting containers or direct sowing in garden beds
Growing Tips
Optimal soil temperature for germination is 45-68°F (7-20°C). Seeds germinate best at 50-70°F with emergence in 7-14 days. Germination is inhibited above 85°F and germination rates drop significantly above 25°C without pre-treatment. Pericarp removal or scarification can overcome temperature inhibition. Keep soil consistently moist but not waterlogged. Use fresh seed as viability deteriorates rapidly in storage.
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