Posted: 27/04/2017 at 13:47
My lilac is still in flower. unless you live outside the uk it's unlikely that you have collected ripe seed.
Seed sowing for shrubs can be made to sound complicated, weeks in and out of fridge and lots of messing around. All you need to do is follow what the plant is doing. When it starts to drop seed, collect and sow. Don't save it, sow it. Put it in gritty compost, leave it outside someone shady, leave it alone, it will get watered when it rains, frozen when winter comes. That's how it works and it will germinate when it's ready.
Fancy cultivars of lilac don't come true from seed