I made one of those really silly mistakes today. I've been desperate to get the last tray of Calabrese out onto the allotment - they were getting pot-bound and a bit miserable, but I was waiting for my Build-a-Balls to arrive to make sure I could net them as soon as they were in.
So there I was merrily popping in a tray of Calabrese Chevalier (a late-maturing variety I hope will follow on from the Pacifica).... and then happened to notice there were two labels in the tray. One half was indeed calabrese... but the other half was the purple-sprouting broccoli I had planned to pot on so they could follow my summer cabbage (or maybe the early calabrese, depending on which came out first).
Now if you've ever tried to tell the difference between calabrese seedlings and PSB seedlings - forget it. I would have thought the PSB would be gratifyingly purple, and one or two were, but not enough to be sure. It's infuriating and almost certainly means the massive PSB plants will overshadow my poor beleaguered calabrese later in the season.
Moral of the tale: never, ever sow more than one brassica in the same tray. They all look the same. And it's bound to end in tears.