Get that leaf and any others out of the soil.
I think it looks like it might have been laying down in the dirt a little. Either way I would remove the leaf so your plant doesn't spend energy repairing it.
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These things have been doing good and I will be topping them when they reach the 16-19" mark. I have read that it is good to wait until around this height to top, that way root production doesn't vault too prematurely.
Also. I think I have spotted male.
He is growing taller than the plants...