Oriental Poppies are easily grown and need little attention.  

Positioning
Firstly, give careful consideration to where you want to grow your 'Place Pigalle', as Oriental Poppies don't like being moved about.  
Choose a sunny position in well-drained soil.
 
Remember, as with all perennials, not to plant too deeply. The plants shouldn't be any deeper under the soil than they were in the pot you bought them in. If you are planting a bare root, the eye at the top of the root should be only just under the soil surface.  

Mulch around but not on top of the plants with 3 inches of organic compost.    

As time goes on
A light application of organic fertilizer, and a 3" mulch of organic compost each spring will help plants to flourish.
As foliage starts to die back, cut off the spent flower stems at the base.  

To seed, or not to seed?
Poppies produce seedheads which may be very attractive either left on the plants, or used in dried flower arrangements. If the seeds are allowed to spread into the garden you'll get lost of new poppy plants, but the chances are that they won't look anything like 'Place Pigalle', as this variety is a hybrid and therefore doesn't come true from seed.