This happens! The genetics of a seed can be altered if pollen from another foxglove is introduced, carried by our pollinators, or if your purple plant was a hybrid. Hybrids have more than one parent and the offspring end up with various genetic combinations of the two. The white flower is also a normal variant meaning Digitalis purpurea is normally purple but other colors occur naturally. Native purple coneflower also produces the occasional white coneflower naturally.
Answered on May 21, 2018
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