Planting Sage Icterina and Sage Purpurascens

Hello all

I hope you are well.

I am having to replace a couple of my Sage Plants, Sage Icterina and Sage Purpurascens due to them struggling, badly.

What is the best way to Plant these?

They will be supplied in 9cm Pots and will be Planted in a South Facing Border.

I know they are Drought Tolerant once established but how should they be watered until they become established?

Also, should I use Microcorzal Additive in the Planting Hole?

Thanks in advance

Kevin