While collecting native specimens for a herbarium during the fall of 1923, it was noticed that several species bloomed quite late, and would stand freezing and thawing time after time, without apparent damage to the flowers. A geranium which was left out of doors in a flower pot, and lived until the latter part of December, aroused our curiosity as to just how much cold weather some plants would stand.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Poulter, R. W.
"Some Winter Flowering Plants,"
Proceedings of the Iowa Academy of Science, 31(1), 271-274.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/50