SEE AMSTERDAM'S TULIPS WITH CL For garden lovers, Amsterdam's tulips make ... the country’s wealthy middle and upper classes, with growers competing for the custom during the economic boom ...

Spread across 80 acres, it's one of the world's largest spring flower gardens, with 800 varieties of tulips. Owen Carroll: That's a tulip. That's a tulip, yeah. Narrator: Gardeners like Owen ...

In a giant greenhouse near Amsterdam, Dutch engineer Bert de Groot ... That warmth is heating the hothouse where rows of tulips grow, cutting the farmers’ reliance on gas. Gas has become more ...