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Jam Session™ Plum on Marianna GF 8-1 (Spring 2021)
An late-season, self-fertile plum, ideal for preserves. Also known as NY 111, NY 58.911.1.
This tree tends to biennialism and will need diligent pruning to maintain regular bearing. It is highly resistant to black knot and brown rot, and trial plantings show no evidence of brown rot even in wet weather on unthinned fruit. Jam Session™ is partially self-fertile, but for optimal fruit set and quality European plums should always be planted with a pollenizer nearby. The developers recommend Damson and NY 9™.
Jam Session™ ripens at the end of plum season, about two weeks after Stanley. The fruit is small, comparable to Damson, with purple skin and yellow flesh that is partially freestone. The flavor has a good fruity character with no astringency. This plum is highly recommended for jams and jellies. The cooked fruit is a beautiful deep, purple-red that is slow to oxidize.
Jam Session™ is an open pollinated seedling of Late Muscadet, bred by John P. Watson. It was crossed in 1958 and selected in 1978.
Please Confirm
The Fruit
Fruit Type
Category: Plum
Subcategory:
European, Self-Fertile
Fruit Uses & Storage
Uses: jam, jelly, sauce
Storage duration: one to three months (approximate, depending on storage conditions)
Fruit Appearance
Skin color: blue
Flesh color: green
Fruit Origins
Parentage: Late Muscadet open pollinated
Origin: Geneva, New York
Introduced in: 2005
Introduced by: John P. Watson
The Environment
Calendar & Geography
USDA zones: 5 - 8
Chill hours: 0
Ripening date: Sep 15 (approximate, in New York State) + 14 days after Stanley
Tree Height & Spacing
Rootstock: Marianna GF 8-1 Rootstock
Rootstock size class: Standard (100% Size)
Tree spacing (natural spread of tree): 35'
Good for wildlife planting? N
Diseases & Pests
Black Knot: Resistant
Bitter Rot: Very Resistant
Pollination
Pollination Factors
Bloom group:
Is it self-fertile? Partial
Is it fertile? Y
Ploidy: Diploid
Rootstock size class:
Standard (100% Size)
Pollination Partners
This table shows the first few results from a full search for pollenizers of Jam Session™ Plum on Marianna GF 8-1. Please see our Pollenizer Search to run other queries and read how the application uses various factors. Also read more about fruit tree pollination.
See all pollination matches for Jam Session™ Plum on Marianna GF 8-1
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