Sadly, I only dream of having enough larkspur to worry about thinning. This may be my year though. I'm trying two different methods and one of them is bound to pay off. I hope.

All I know is what I read in Armitage, who suggests anywhere from 4-6 inch spacing up to 10-12 inches.

Good luck with yours, however you thin them.

ThinMan

Thanks, Thinman!

Teresa