No idea about the first two, but we get any where between 1 and 2 hundredweight of the latter. We like the taste!

Would love to be able to tell you but our young Merryweather only had two damsons last year. Hoping for better things thi year! Never had a poor damson anyway, so don't stress too much. You don't say where you live but if you are liable to late frosts choose the one that flowers later.