Skip to main content

Longjohn Plum on Krymsk 1 (Spring 2024)


A bigger, better prune-plune developed at Cornell. Also known as Long John.

The tree is vigorous, upright, spreading and somewhat willowy in growth. Precocious and productive, it is partially self-fruitful, but heavier cropping will be obtained with a good pollenizer. Suitable partners include Polly, Stanley, Castleton, and Victory. This tree is sensitive to mites and canker, but resistant to bacterial spot.

Ripening with Stanley, Longjohn is a large, long, teardrop-shaped, attractive blue plum with fruits that are freestone and very high quality in the style of Iroquois, one of its parents. The skin is dark purple-blue covered by waxy bloom, and the flesh is amber, smooth textured, and similar in firmness to Stanley. It is suitable for packing and shipping. In taste tests this has been my favorite. 

Longjohn is named after the late Geneva plum breeder, John P. Watson. 

Order Your Trees

Select a shipping year

Select a grade

$41.75

Sold Out
Quantity
Best Pricing

Log in to your account to access the best pricing based on your past purchases; also see wholesale information

Tree Grading

Grade is a measure of tree size at time of sale, with Grade 0 being the biggest; see pricing & grading

Custom Trees

For large orders to be delivered in future years, or for trees from your cuttings, you can order custom trees

Need Help?

Contact us


The tree is vigorous, upright, spreading and somewhat willowy in growth. Precocious and productive, it is partially self-fruitful, but heavier cropping will be obtained with a good pollenizer. Suitable partners include Polly, Stanley, Castleton, and Victory. This tree is sensitive to mites and canker, but resistant to bacterial spot.

Ripening with Stanley, Longjohn is a large, long, teardrop-shaped, attractive blue plum with fruits that are freestone and very high quality in the style of Iroquois, one of its parents. The skin is dark purple-blue covered by waxy bloom, and the flesh is amber, smooth textured, and similar in firmness to Stanley. It is suitable for packing and shipping. In taste tests this has been my favorite. 

Longjohn is named after the late Geneva plum breeder, John P. Watson. 


The Fruit

Fruit Type

Category: Plum
Subcategory: European

Fruit Uses & Storage

Uses: fresh eating, jam, baking, canning, freezing, jelly, sauce
Storage duration: one to three months (approximate, depending on storage conditions)

Fruit Appearance

Skin color: blue
Flesh color: orange

Fruit Origins

Parentage: Iroquois x CA4A33L
Origin: Geneva, New York
Introduced in: 1993
Introduced by: NYSAES; R.L. Anderson, J.P. Watson, and K.G. Livermore

The Environment

Calendar & Geography

USDA zones: 5 - 8
Chill hours: Not yet determined
Ripening date: Sep 01 (approximate, in New York State) + 0 days after Stanley

Tree Height & Spacing

Rootstock: Krymsk 1 Rootstock
Rootstock size class: Semi-Dwarf (40% of Standard)
Tree spacing: See details
Good for wildlife planting? N

Diseases & Pests

Bacterial Spot: Resistant
Bacterial Canker of Stone Fruit: Susceptible

Pollination

Pollination Factors

Bloom group:
Is it self-fertile? N
Is it fertile? Y
Ploidy: Diploid
Rootstock size class: Semi-Dwarf (40% of Standard)

Pollination Partners

This table shows the first few results from a full search for pollenizers of Longjohn Plum on Krymsk 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.

Tree Ships Currently in Stock
Castleton Plum on Krymsk 1 2024 0
Damson Plum on Krymsk 1 2024 0
Empress Plum on Krymsk 1 2024 0
Gras Ameliorat Plum on Krymsk 1 2024 0
Lavina Plum on Krymsk 1 2024 0
Polly Plum on Krymsk 1 2024 0
Reine Claude Conducta Plum on Krymsk 1 2024 0
Rosy Gage™ Plum on Krymsk 1 2024 0
Victoria Plum on Krymsk 1 2024 0
Jam Session™ Plum on Myrobalan 2024 0
Kubanskaya Plum on Myrobalan 2024 0

See all pollination matches for Longjohn Plum on Krymsk 1