Product review for Mars Seedless Grape Overall Rating: Write an online review and share your thoughts with other customers Sort Reviews: Newest | Oldest | Highest Rating | Lowest Rating   :: Viewing page 1 of 1  -  Saturday, December 08, 2007 Mars Seedless Grapes Reviewed By: Danny Grogg (Aloha, Oregon) The first two plants I got died but then I bought two more and they thrived! I had 6 to 7 clusters on one vine! They were so juicy and delicious! The best part is it with stood 19 degrees!