Why a Cardinal Flower Changed from Red to White Blooms

Why a Cardinal Flower Changed from Red to White Blooms

A gardener transplanted a red cardinal flower (Lobelia cardinalis) last year; this year it bloomed white. They amended clay soil with peat.

Explanation

Soil pH does not change flower color in cardinal flowers. The most likely scenario: the original red plant died, and a white-flowered seedling (volunteer) from its seeds grew in its place. Many native plants produce white-flowered offspring spontaneously. A plant changing its own flower color is virtually impossible.

What to Do

Enjoy the white form—it's a natural variant. If you want red, purchase a new red plant or collect seeds from a known red population.