Anthemis from seed-painfully slow to make progress after germination

in Plants
A month ago I sowed a packet of Amthemis Tinctoria Kelwayi seeds.
They did not take long to germinate. Very tiny seedings when they emerged-like the thinness of a hair.
When they grew a pair of leaves, I potted each one on in to tiny pots. Still in these pots as per the photo.
They just seem to be painfully slow. I have given them some 'seedling strength' Phostrogen. I am cautious though. I don't want to mess things up.
I went past the house a few days ago, where I had orginally been inspired by the plant that Pete.8 identified from the photo I took as an Amthemis-a year ago! (Thank you Pete). Obviously I have dragged my heels somewhat.
I should have bought a couple of established plants back then.
Has anyone grown these from seed, and how long was it before they were large enough to plant in the garden?

Perspective

They did not take long to germinate. Very tiny seedings when they emerged-like the thinness of a hair.
When they grew a pair of leaves, I potted each one on in to tiny pots. Still in these pots as per the photo.
They just seem to be painfully slow. I have given them some 'seedling strength' Phostrogen. I am cautious though. I don't want to mess things up.
I went past the house a few days ago, where I had orginally been inspired by the plant that Pete.8 identified from the photo I took as an Amthemis-a year ago! (Thank you Pete). Obviously I have dragged my heels somewhat.
I should have bought a couple of established plants back then.
Has anyone grown these from seed, and how long was it before they were large enough to plant in the garden?

Perspective

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All the pots are exactly the same size. The phone camera angle depicts otherwise.