Why Do My Concord Seedless Grapes Have Seeds?

Question

My grapevine produced the first time last summer, but the grapes have seeds. The label is marked: Grape Seedless, “King Of The North” vitis labrusca.

Answer 1

They are what is left of what would be a seed. They aren't a seed, themselves. They will not germinate, and are not viable.

Now, leaving them on the vine for too long, as well as a few other environmental factors, can cause these false seeds to be larger and more noticeable.

This collection of articles will help you with more information on grapes:

https://www.gardeningknowhow.com/edible/fruits/grapes