I received these seeds many years ago from a seed company that had gotten ahold of what was considered a 'feral' population of plums that were thought to be a cross between American plum and beach plum. Although the ranges overlap, the flowering of these two distinct species do not overlap very much. As a result it is thought there is no such thing and that all Dunbar plums are of 'garden' origin. Much to my surprise when I put out the plants and fruited them, the intermediate characteristics were very distinctive and different than all the other dozens of Dunbar plums I grow. They have a strong stoloniferous tendency of the American plum along with a smaller fruiting beach plum. This combination is critical if you want to create hedgerows of wild plums. You need plants that are very vigorous that can integrate with other plants quickly. New Yorker does that.
Fruit production is from medium to heavy within this group. Certainly you could find heavier fruiting types and clone them using just the stolons. This would allow you to develop cultivars that are easy to root as well as heavier fruiting types. From seed you could create a plum hedge effect that would be a self reproducing colony capable of replacing itself as the mature trunks die off after 15 years or so . On average American plums are short lived as the main trunks fade after 15 years, so the stolons continue the colony ad infinitum. The bright red and blue plums have a thick skin and can be eaten fresh or cooked for jam and jelly. The skins have some astringency but not overbearing like the American plum. Fruit size runs from 1/2 inch to 1 inch in size.
To germinate the seeds: Seeds have been cleaned and stored dry but not overly dry. Add moist peat moss to the seeds and store at room temperature for days. Then put in the refrigerator at 38F to 42 F. Store for 90-120 days. Some sprouting and cracking of the shells may occur after 60 days. Other seeds will not sprout the first season so do not throw out the seeds. After 90-120 days take out the seeds and put at room temperature. Seeds will sprout over a period of a month. You can pluck them out and plant in well drained soiless media. Careful not to plant too deep as this will cause damp off.
400 seeds per packet
|Genus & Species||Prunus americana x maritima|
|Hardiness||-30F possibly more|
|Height (ft)||5-7 ft. Width to 3-4 ft. Tends to be a more upright plant with light branching that splays outward.|
|Pollination Requirements||For good fruiting have several individuals of this same strain within a few feet of each other.. Possibly will cross with other beach plums and American plums but flowering timing is an issue. Also self fertile and not subject to sterility in pollen.|
|Soil||Does very well in dry sandy soils with low air humidity. Slightly acidic soils ideal. Very good in loam soils too.|
|Climate||Zone 3-8. Best in cold climates in short seasons.|
|Ease of Cultivation||One of the easiest plums to establish. Because of its stoloniferous habit, it is one of the easiest hedgerow plums to use and could make it possible to select cultivars based on vigor and fruit production. Has no issues with curculio.|