I have just bought PSB and calabrese Marathonseedlings from B and Q

Have I wasted my money, is it too late to plant them out?

They are in the polystyrene trays and have 4 or 5 leaves each.  Do I need to pot them on first or shall I split them and bung them in the soil?

And, if I manage to keep the slugs off them, when might I harvest?

Thank you anybody, I find calabrese and broccoli planting and harvesting times very confusing
 

Thank you muofstig, will plant out PSB now.  B and Q haven't specified early or late PSB.  The label says plant out July to Sept, harvest Sept to Nov.  Don't think this makes sense, it'll have to grow quickly.

The calabrese label is the same .  How about potting the seedlings up, bringing into the greenhouse in autumn and planting out early next year?

Thank you muofstig, will plant out PSB now.  B and Q haven't specified early or late PSB.  The label says plant out July to Sept, harvest Sept to Nov.  Don't think this makes sense, it'll have to grow quickly.

The calabrese label is the same .  How about potting the seedlings up, bringing into the greenhouse in autumn and planting out early next year?

The PSB seedlings are a bit late but might make a crop. They may not have long enough now to make a decent framework depending when cold weather arrives.

The calabrese should be OK to produce a crop October/November. They may need a fleece if the weather comes cold.

Marathon - last year I grew it and despite the wet summer produced a summer crop (main head), and a second cropping (smaller spears) in autumn, and well into winter (January) and through to spring, yet another batch of spears    I only dug it up because I needed the bed for something else but I think it was on its way out anyway by then.  There was no fleece, just netting to keep the cabbage whites/pigeons out.