Growing
Watering
- Be sure to water the young trees heavily every week during the first growing season to help promote growth. Then, water regularly. It’s best to water the plant deeply at the soil line, then let the soil dry out (though not completely) and water again.
- If rain is lacking, water your tree well into mid-October to give it plenty of moisture through the winter months.
Fertilizing
- Do not fertilize young fruit trees until they have set a crop.
- Once established, fruit production requires regular fertilizing all year long. If there’s good fruit set, fertilize with one pound of calcium nitrate per tree or 1½ pounds of 10-10-10. Cut back the nitrogen in fall and winter to avoid encouraging new growth in those seasons.
How to Prune Plum Trees
When to Prune
- Prune in early spring or mid-summer to avoid infection. The best time for pruning is usually spring for young trees and mid-summer for established ones.
- Do NOT prune in the fall. Winter injury and infection may occur.
Thinning Fruit
“Thinning” is the process of removing developing fruit from a tree in order to increase the overall quality of the produced fruit and to prevent damage to the tree.
- Thinning is usually done about a month after blooming ends in the spring.
- Leave 2–4 inches between each fruit, removing those in between.
- Thinning helps to prevent branches from breaking under the weight of the fruit. If branches do break, prune them back to undamaged wood, ideally cutting back to a natural fork to avoid leaving stubs.
Pruning Japanese Plum Trees
- If you have a Japanese variety, the best pruning method is to create an “open center” shape, where the central trunk is cut short and several large branches radiate outwards from its tip. In the summer of the first year, cut the vigorous shoots that form on the top of the tree by two or three buds. After about a month, check the tree. As soon as you have three wide-angled branches, spaced equally apart, cut back any other branches so that these three are the main branches. In the early summer of the second year, cut back the branches in the middle of the tree to short stubs and prune any shoots developing below the three main branches. After the third year, remove any shoots in the center of the tree to keep its shape.
- Japanese types require heavy pruning to help keep them in shape and to produce better fruit. It is also good to thin out the fruit on these types of trees. You should space the plums about 3 to 4 inches apart on each branch.
Pruning European Plum Trees
- If you have a European variety, the best pruning method is to create a central leader. This shape features a central trunk with branches that spiral out every 5 to 8 inches, making sure that no branch is directly above another. The training for such a system begins in the early summer of the first year, during which time you should remove any shoots that form within 18 inches of the ground. The end result should resemble a Christmas tree.
- European types do not typically require fruit thinning because they do not produce as much fruit as Japanese types. However, the fruit on these types should be spaced about 2 inches apart on each branch.
For more pruning tips, check our spring pruning guide.
Types
There are three major categories of plum trees: European, Japanese, and American hybrids.
European
The hardy European types do well in most regions across the U.S., and are generally self-fertile. If you have space for only one tree, go with a European plum. (However, even self-fertile trees will produce better if cross-pollinated with a second tree.)
For a European type, try the ‘Stanley’. This semi-freestone type works great for the eastern, midwestern, and some of the northwest regions of the U.S. It is self-fertile, meaning no cross-pollination is necessary. It’s harvested in late August, producing medium to large plums with dark blue skin and greenish-yellow flesh and is great for cooking, canning, or eating fresh.
Japanese
The Japanese types flourish where peach trees thrive (warmer regions, generally). The Japanese plums’ early blooms make them more susceptible to spring frosts in colder areas. They need to cross-pollinate with a second variety.
For a Japanese type, try the ‘Satsuma’, which produces large, dark-red plums. This kind is good for eating fresh and canning because of its sweet taste.
American Hybrids
American hybrids are typically the hardiest of the plums, with some varieties surviving as far north as Zone 3. They need to cross-pollinate with a second variety.
American hybrid trees, such as ‘Alderman’, ‘Superior’, and ‘Underwood’, are all popular choices. These trees combine the taste of the Japanese variety with the hardiness of the European variety. These types work well for regional extremes.
Order bare-root, rather than container-grown trees, if possible. Bare-root plants usually establish better. A well-established tree will yield up to 2 bushels of plums from late summer into fall.
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Comments
If your plums have their first flush of color, they should ripen off the tree. Pick them and put them on a flat tray in a cool room for a few days and they should ripen up. In the future, if you want to keep this tree, you need to prune it and also thin the fruit when young so it's less loaded down. For plum trees, you want to thin in April/May when the fruit is about 1 diameter and about 2 to 4 inches apart.
Stanley prune plums are compatible with zones 5 to 7. Here is a zone map: http://www.plantmaps.com/interactive-washington-usda-plant-zone-hardiness-map.php
Cherry plums are traditionally not thinned. In terms of harvesting, they have a long range for ripening, so you really just need to look at the fruit. It's best to wait until they are fully mature, but before they fall from the tree. The best way is to take a couple samples and taste test! The fruit will become softer and the flesh will become juicier and sweeter. Often, it's the birds who will know and pick you clean! Netting is usually the best way to deter birds.
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Your tree had a fungus called Black Knot. You need to prune out any infected areas, preferably before bud break.
Prune 2 to 4 inches below each knot. If pruning is not possible because knots are present on major scaffold limbs or the trunk, they can be removed by cutting away the diseased tissue down to healthy wood and out at least 1/2 inch beyond the edge of the knot. Burn or bury the prunings in early spring.
Fungicides are necessary and will provide the greatest benefit if applied before rainy periods, particularly when temperatures are greater than 55 degrees F. You need to maintain pruning, too.