Jamestown started with 500 people, what did John Rolfe discover when he arrived?

The group finally arrived in Virginia, near the Jamestown settlement, in May 1610, and Sarah died soon after their arrival. ... By experimenting with growing and curing tobacco from seeds obtained from the Caribbean, John Rolfe developed the colony's first profitable export

He is credited with the first successful cultivation of tobacco as an export crop in the Colony of Virginia.

Explanation:

About 1612 he began to experiment with growing tobacco. When he found that the local variety was too bitter for English tastes, he began cultivating seeds that he brought from the West Indies.

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