Saint Theresa Seedless grape: glorious grape

Vitis x 'St. Theresa Seedless' Plant Select

Saint Theresa Seedless grape (Vitis x ‘St. Theresa Seedless’) is a superb new table grape for the Rocky Mountain region. This very hardy and mostly seedless (an occasional seed or two is discovered) purple grape offers an abundance of large clusters of sweet fruit in early September. There is plenty of time following the harvest for the plant to store energy for winter. The vine is vigorous and healthy, showing little concern for our alkaline soil conditions. This is an exceptional selection bred by Elmer Swenson of Osceola, Wisconsin, renowned for breeding many selections of cold hardy grapes. Saint Theresa Seedless grape has notable grapes such as Concord and Thompson Seedless in its lineage.

This wonderful, versatile vine was named in honor of Saint Theresa of Lisieux, France, the Carmelite Nun who showed her love of God by planting flowers. She is the patron Saint of many, and of the local cities of Pueblo, Colorado and Cheyenne, Wyoming.

View the plant profile here.

 

 

 

St. Theresa Seedless Grape (Vitis x ‘St. Theresa Seedless’)

Woody Vine
Height: 15-20 feet
Width: 3-8 feet
Blooms: Inconspicuous
Sun: Full sun to partial shade
Soil Moisture: Moderate
Hardiness: USDA zones 4-9
Culture: Garden loam

Thanks to Scott Skogerboe, Fort Collins Wholesale Nursery, for writing this piece.

2 responses to “Saint Theresa Seedless grape: glorious grape”

  1. Barb says:

    Question: My St Theresa grapes have been in 5 years now and are huge. I only put up a 5′ trellis so am trying to get them to grow out instead of up. The leaves taste great. I prune it severely in May, but it is so prolific that the grapes are small and sour. I leave them for the birds. Should I prune it all summer to try and contain it? Should I try for fewer bunches of grapes to see if they’ll grow larger? Thanks for the help!

    • Pat Hayward says:

      From Scott Skogerboe… sounds like you need to thin out some of the clusters: “I’d suggest you leave every leaf alone and continue cutting out the fruit clusters until they are to the size you want. Give them plenty of water, but once a week deeply is enough – roots need air as much as they do water. Water-logged soil can cause decrease in plant health, even death. Fertilizer is great until the middle of August but then stop so as to allow the grape plant enough time to prepare itself for winter. Pruning off lateral branches encourages terminal growth if you want a tall vine, but lateral branches have lots off leaves which produce carbohydrates through the process of photosythesis, so you have to make a personal judgement. Winter watering on warmer days during times of little to no snow cover is also critical.”

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