Just planted some out today. Didn't separate it either It was English Lavender. We will see how it does.If I can remember where I put it!

I broke my one container into three clumps. Two made it. They like fast drainage and southern exposure. Hidcote will reach 18" here in my area. Spanish lavenders can get well over 2-3' once established. Provence is the one I have the most of and it's just starting to bloom. I purchased seedlings last year from the herb rack at Lowe's.

This is the 2nd yr I've WSed them. I potted them up into a bigger pot, to give them more root room. After they started looking like Lavender,and not a teeny plant in the pot, I put them in the ground.
One of our nurserys here offers class's during the winter months. I took one on Lavender. There suggestions for drainage is to put a handfull of sand in the hole and mix it with some dirt. Mulch with rocks, not wood. Don't remember why, but I did it, and they seem to love it. Fertilize lightly, if at all, it makes for stronger scented flowers.

brightmore,
that's a good idea - to pot them for an interim growth stage.
and I've read that lavendar likes lime.