Spinach does best in cool weather. Plant any variety from Mar.1-Apr.15 and after Aug.1. For late spring and early summer plantings, use Space. Spinach will bolt (flower) when days are long and hot. Some varieties grow enough leaf to harvest before they bolt. For continuous supply plant every 3 weeks. 
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Set seeds 1cm (1/2&quot;) deep 10 seeds per 30cm (12&quot;) in rows 30-45cm (12-18&quot;) apart. Plant deeper in hot soil (down to where the moisture is). On the farm: 100&#39; of row needs 28g of seed. An acre will use 4-5kg (8-10lbs).
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Germination temperature is 45 to 75 F, but will germinate at soil temperatures as low 40 F. At least 65% of seeds will germinate in optimal conditions. Seeds will sprout in 6 to 21 days, depending on soil temperature. Usual seed life: 3 years.