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For germination temperature: 15-20 Celsius Germination time: 17-20Days Evening primrose enjoys a slightly acidic soil with a pH of 5.5 to 7 that is also a bit sandy. Make sure the area has good drainage. Sow the seeds during early spring or early autumn by scattering the seeds over your prepared plot of soil. Cover the seeds lightly, about one-eighth inch, with sandy potting soil. Water the seeds in lightly.