Winter citrus — it can warm up any cold day (and recipe!) with its sharp, bright notes of acidity and freshness. But what kind of citrus fruit should you use in baking, cooking, and snacking? Do ...

For those in tropical climates, there's no shortage of beautiful plants that grow in warm conditions. Here's another that ...

A version of this story appears in the February 2017 issue of National Geographic magazine. Citrus, in many ways, stands alone. So many cultivated species have come from so few primary ancestors.