What is destroying my oriental chives?

Sammymummy

Hi everyone

I'm hoping someone will know what is destroying my oriental chives. They are covered in tiny black stuff that are similar to aphids and the chives have lost vigour and gone yellow. 

I must say it happened last year, so I turned the pot out and carefully removed all traces of the black stuff and re-potted in fresh compost in a cleaned out (different) pot. It grew well during the summer but it is now subject to the same fate as last year. I have other pots nearby but these are the only ones suffering. Does anyone know what these pests are and how to deal with them?

Many thanks

nutcutlet

I don't know what oriental chives are but ordinary chives die back at the end of the season and re-grow in the spring

Sammymummy

Hi nutcutlet, oriental or Chinese chives have flat leaves and generally taller. 

Borderline

Is it Allium Tuberosum. White flowers and leaves are broader. Your pictures don't look like those ones. But it's possible they have rotted and that is why you are seeing black specks. I think your pots may have drainage issues or you have over watered them over a prolonged period.