It could be. When I moved into my current home, I discovered a small hydrangea plant growing away from the only hydrangea that there used to be there. Has not happened to me again ever since though.That shrub was not a rebloomer plant though.

I have 7 in pots that came up between my Lady in Red and Endless Summer-the lacecaps seem to self-sow much more than mops-this is their first year hope to see what they are in a year or so. Your answer is yes!!!

Very exciting! How tall have they gotten so far?

I'd imagine you'd end up with Twist n Shout type plants, if you crossed LIR and ES. I think I have a cross between ES and Shugert (summer lace) coming up a bit. Overwintering the seedlings is the hard part...

Micheal Dirr discusses saving seed from your Hydrangeas in his hydrangea book. Al

They overwintered in the pots and are now about 6 inches-some have the red stems-most do not but all have the narrow LIR leaf . Some are smooth and some very serrated leaves

5 survived this winter in small pots--6-8 inches tall. will see if any bloom....

Cool. I'd personally like to see some natural crossing between some the elaborate Dutch/Japanese entries and TnS / Tuff Stuff / Shugert, etc.

not sure will see blooms this year but will post when I do...They certainly have LIR hardy stems.