what would u get to fill this pond

[bcfcforever]

okay so i have a 3000 litre pond i would ike some plants to add into it please can you loverly people help me on what plants to put into it the sizes of the ledges are in the photos
please help an btw height is how tall i would like the plant or how tall the plant could grow thanks

 

[dieselplower]

Iris, purple pickerel weed, corkscrew rush, are about the right sizes.

 

[1.0reef]

One of my favs is Parrots Feather, but they grow incredibly fast and most I see FS are larger specimens.
Many reeds are good to add height, it's a general term, but pretty much all of them have relatively similar looks and often are tall.