More Primrose seeds planted

On last Friday's Gardener's World there was an item about planting Primrose seeds. Apparently if sown while green, the seeds will germinate in a few weeks and the new plants will flower next spring. If left to turn black, the seeds will become dormant and when sown will wait until next year to germinate. Also they did cover the sown green seeds with gravel, so I covered the seeds I planted on 26 May with a thin layer of compost (although the seeds have now gone brown so maybe it's too late for them to germinate this year). The earlier sowing was of seeds from a plant with blue/yellow flowers, today's planting was from Primroses with red/yellow flowers.