Post by darrenabbey on Aug 17, 2015 20:24:06 GMT -5
I'm not sure, actually. I remember reading that phrasing as market-speak, rather than anything specifically meaningful. It is definitely "improved" from the vendor perspective because it is a F1, so you'd have to return to them for seed each year. One seller (http://guide.alibaba.com/shop/new-early-classic-san-marzano-shape-tiren-f1-tomato-seeds-fruit-vegetables-seeds-50-seeds_6232221.html) describes it as "Earlier and higher yielding" than San Marzano, which would be useful, as the San Marzanos I've grown have been somewhat late/slow in production.
The few times I grew the regular SM I didn't note any BER, but I'm now on new property with totally different soil. The previous yard was heavy clay, while this one is mostly sand. Tiren might have done just fine in the clay (as the SM did).