The effects of temperature, date of sowing and the presence or absence of light on the percentage germination by seeds of Lychnis viscaria L. (Viscaria vulgaris Bernh.), Potentilla rupestris L. and Veronica spicata L. were studied. It was found that both in controlled environments and in the open, the order of time-to-germination was the same, namely L. viscaria, V. spicata and finally, P. rupestris. The latter species required a temperature in excess of 10°C to germinate and V. spicata required light to germinate. A small (< 5%) number of V. spicata seeds did, on occasion, germinate in the dark and the seeds of this species whether fully imbibed or not, required a shorter period in the light than P. rupestris. Because the seeds used were stored and germinated under artificial conditions these findings can only serve as a first, but important, stage in understanding how the seeds germinate in nature.
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