Retarded Germination


I SHALL be much obliged to any of your readers who can give an explanation of the probable cause of the above phenomenon, which I have remarked this year. I sowed a number of patches of seeds of various hardy annuals in the garden in the last week of April; about half of them came up after the usual interval, strongly and regularly. Such were Calendula Pongei, Convolvulus minor, Lavatera trimestris, Collinsia bicolor, Iberis white and red, Specularia speculum, Linum rubrum, &c., &c. Then there were some of which a few scattered seedlings made their appearance at this time, and after an interval of about six weeks the greater part of them also came up; among these were Eutoca viscida, Nigelia damascena, Sphenogyne, and Clarkia pulchella. Thirdly, there were some of which I quite despaired; mignonette, however, appeared thinly about the end of June, and at intervals till August; and in the middle of June a few plants (in proportion to the seed sown, a few) of Linaria bipartita, Madia elegans, and Xeranthemum came up—one consequence being that the last named has not yet flowered. Some of the seeds were obtained this spring from seedsmen, some were my own collection of the last year or two—of the latter were Calendula, Lavatera, Convolvulus, Specularia, Eutoca, Nigella, Sphenogyne, and mignonette—so that cannot be said to give any clue. The conditions for germination and growth were favourable, and the season also. I have never remarked before any annuals so long in appearing above ground; though in some herbaceous plants I have noticed it, e.g. Gaillardia, Myosotis alpestris, and Anemone coronaria.

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A., E. Retarded Germination. Nature 41, 31 (1889).

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