Question about separating

Question about separating

I have a beautiful, thriving pink bleeding heart that I planted a couple of years ago in front of my house. My mother in law asked this morning if she could have some, which I have absolutely no problem with. My question is this - it's flowering all over the place. Can I do it now or should I do it before/after flowering?
re-planting hydrangeas?

re-planting hydrangeas?

Red Lily Beetle alert.

Red Lily Beetle alert.

balloon flowers

balloon flowers

H. Pacific Moon

H. Pacific Moon

My first garden.

My first garden.

The New Garden Bed

The New Garden Bed