Princess is similar to Thompson. Color about the same, matures about the same time, but has some distinct improvements. The berries are twice as big without the need for growth regulators or all the other stuff needed to size up Thompson. Princess has more flavor IMO. It's a mild muscat flavor esp on berries with lots of sunlight.

It's an extremely pretty bunch of grapes. Not too tight or too loose. I think you'll like it.

They are calling Princess improved Thompson as a marketing tool. They know people recognize Thompson and want to leverage that to market Princess. It's not literally improved Thompson but IMO it's a very good and accurate description.

Princess is the green grape on the right. That's the natural berry size with no manipulation.

Thank you fruitnut, much appreciated. I have never tasted princess before but Thompson seedless has always been my first priority and the first grape I have planted in my previous homes. Since you have the vine, Is princess as sweet as Thompson, have similar taste? IMO, the term "improved" should be used for same plant/fruit but with more diesese tolerance or climate resistance. Since I only have space for one green grape I didnt want to gamble on this. I'll see if I can find princess to taste and make a decision to whether keep it or replace it before the roots of this one are established.

Thanks again.

Both are pretty mild tasting grapes to me. Primarily sweet with a little more Muscat flavor in Princess. If you haven't tasted Muscat grapes I'd say it's clearly the best tasting grapes I've had. Summer Muscat has a strong Muscat flavor and is by far the best tasting grape I've eaten. Princess is very mild by comparison in fact you might not even notice.

My Princess usually run about 24-26 brix, they are very sweet. You can improve sweetness in any grape by thinning out the excess clusters. Princess is very productive and sets heavily. Vine is medium to high vigor.

I assume you are in CA. If you have warm summers and lots of sun your results should be as good as mine. With a cool and/or short summer neither will do well.

You could easily plant both varieties in the same hole. After you taste the fruit remove one if you think that's best. They will both bear even in tight quarters.

May be I have tasted the princess, don't recall. I'll probably replace it with Thompson seedless.

Thanks fruitnut, you have been very helpful and informative. God bless!