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from zoewoodwardgardening:"How to grow:Start seeds in mid-late February. Sow onto the surface of the compost. Seeds require light for germination, do not cover with soil.
Seeds benefit from a bit of warmth to trigger germination, 22-25°C is ideal.
Be careful not to overwater, Rudbeckia don't like prolonged wet conditions and this can cause seedlings to rot.
I like to 'pot on' into 9cm pots which means I can delay 'planting out' until June which is when I find gaps starting to appear in the garden and the early displays in containers go over."

found it at a local garden center herb section.

This plant does not bloom much. I planted it in full sun, very disappointed in its performance. Not worth the money and space.

rebloom in 2021 in zone 6a in July, September and November (different plants). The November one did not survive a frost.

Blue horizon has tall flower stems, makes great cut flower. Better to buy container grown instead of growing from seed. Cut back initial flowers to boost growth and blooming.