That depends. If they are true species and they are pollinated by other ones of the same species, then they will come true. If they are hybrids then they will produce hybrids. Those hybrids may be better or worse than the ones they came from.

yes Owdbggy is correct. and even if true species are pollinated there will be slight variation between plants. just look at your own children [unless women are really from venus and men from mars :o)]

The poenies that have been in the garden for a very long time are pink, Sarah Bernhardt I think, there are two which have resulted in lots of peony plants around the garden, self sown as they are in places no one would (I think) plant a peony (ie green house base). Lilacs are all over the borders but just a couple of stems and not very big. I'll just grow them on and see what they turn out like.

The Lilac is more likely to be a set of suckers than seedlings. Not so sure people would thank you for a Lilac which has the potential to take over a huge area.

Hi Owdboggy you're probably right, I'll think again about the lilacs.