1 litre sized pot.  Echinacea purpurea "Primadonna Deep Pink" is a herbaceous perennial reaching up to 90cm high with deep pink flowers on eye-catching dark stems.  The petals start to cascade down as the flower ages, making the centre cone a dominant feature.  Winter dormant, with hairy dark green leaves in emerging in spring.  Likes a sunny position in well drained soil.  Dead head to promote flowering or leave flower heads to create a lovely display through winter.