Spinach and kale are both nutritious leafy greens and ... These are similar nutritionally, but differ in size and texture.

While kale contains folate, spinach has it beat with more than double the amount for the same size serving," said Gillett.

But take a closer look: Leafy greens like kale and spinach are the humble heroes of late fall, winter, and early spring. Winter greens may be hearty, but they can wilt just the same as more ...