Lena,
Is purple haze an OP carrot ? I didn't try it as I thought it was an Hybrid (??).
MG, the Black spanish carrot is a winter type (main crop), it need cool to swell up. It will grow to 15 to 18cm long (2.5 to 3 cm thick). It is said to be free from carrot fly, sow them from late summer (for autumn/winter harvest) !
I have also Autumn king (orange colour), very reliable carrot !
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