Spinach

Spinach is cool-season garden staple as it prefers cold air and warm soil. You can grow more than one batch of spinach between fall and winter as they only need 45 days to mature. They can also survive in winter without much protection....

This plant prefers rich soil with plenty of moisture to help it grow fast. Sow seeds in well-prepared soil and thin them out. Don’t throw the baby spinach plants away though, as they can be used in salads. You can harvest the entire plant after 45 days, or you can keep plucking leaves all through the season.
A long-lasting persistent myth is that spinach contains significantly more iron than other green vegetables.