For a printable version of this webpage: Plums

Plums
Plums belong to the rose family along with cherries, peaches, apricots and raspberries. There are hundreds of plum varieties grown throughout the world. The two types of plums, European and Japanese, both grow well in the Skagit Valley and most Italian prune types grow well in western Washington. The Japanese plums are a clingstone fruit, making the fruit hard to remove from the pit. They are very juicy and best eaten fresh, made into plum sauce, juice, jams and jellies and not well adapted to drying or canning. The European plums are a free stone fruit, which easily pulls away from the pit. They have a firm-flesh, often used for drying and canning.
Nutrition
Plums are a fair source of vitamin A, vitamin C and vitamin K, and are a good source of fiber and antioxidants. One medium-size fresh plum, about two inches in diameter, has 27 calories, with no fat or cholesterol.
Selection
Choose tree-ripened fruit or slightly under-ripe fruit. Choose plums that are shiny, plump and firm to the touch. Avoid moldy, soft, bruised or those with broken skin. A little brown discoloration on the skin may indicate sunburn, but the plum is safe to eat. Before processing, clean surface with running water.
Storage
Plums are highly perishable fruits because they ripen quickly after harvest. Unripe plums continue to soften after picking. Place in a closed paper bag at room temperature for one or two days to hasten the ripening process. It is not recommended to refrigerate unripe plums. Ripe plums will keep well in the refrigerator for up to a week.
Measurements

Processing Directions for Canned Plums:
| Style of pack | Jar Size | 1–1,000 ft | 1,001–3,000 ft |
| Hot or Raw | Pints | 20 minutes | 25 minutes |
| Hot or Raw | Quarts | 25 minutes | 30 minutes |
Processing Directions for Plum Puree:
| Style of pack | Jar Size | 1–1,000 ft | 1,001–3,000 ft |
| Hot | Pints or Quarts | 15 Minutes | 20 Minutes |
Processing Directions for Plum Conserve:
| Style of pack | Jar Size | 1–1,000 ft | 1,001–3,000 ft |
| Hot | Half Pints | 5 Minutes | 10 Minutes |
Processing Directions for Damson Plum Jam:
| Style of pack | Jar Size | 1–1,000 ft | 1,001–3,000 ft |
| Hot | Half Pints or Pints | 5 Minutes | 10 Minutes |
Preserve Skagit Crop Sheets describe three food preservation techniques—freezing, drying, and boiling water canning—consistent with USDA Food Preservation and Food Safety recommendations. Pressure canning for low acid foods such as meats and vegetables is not included.
Additional resources and recipes, as well as information on Pressure Canning, can be found on the WSU Skagit Food Preservation Website https://extension.wsu.edu/skagit/fam/food-preservation/ or the National Center for Home Food Preservation https://nchfp.uga.edu/index.html.
Copyright 2022 WSU Skagit Extension. Any opinions, findings, conclusions, or recommendations expressed on this fact sheet are those of the author(s) and do not necessarily reflect the view of the USDA. WSU Extension programs are available to all without discrimination




