Criteria: Black, Productive, No Cracking
OP your criteria were productivity and lack of cracking.
For me in a very weather labile are of zone 5 that would be Carbon and Indian Stripe.
Blacks I would not include for my zone due to poor productivity (too late) are anything with Brandywine in its name, Japanese Trifele, Cheroke Purple and Amazon Chocolate, Brads Black Heart and JDs Special C Tex (massive disease in the last one.)
Those with longer seasons, more heat swear by some that don't produce well for me so your mileage may vary.
Stacy
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