Plum care calendar — zone 5

The year at a glance

1. April

   • Dormant / late-dormant pruningPrune · Apr 7 – May 5

     Prune in late dormancy as buds swell. Japanese plums are trained to an open center; European plums tolerate a central leader. Remove crossing wood and any galled or blackened wood, and cut out black-knot swellings well below the swelling.

2. May

   • Bloom — pollinator & cross-pollination awarenessNote · May 26 – May 26

     Plums bloom early; open flowers are frost-sensitive and most Japanese plums need a compatible pollinizer blooming at the same time. Bees are active, so extension guidance is to avoid insecticide application during open bloom. Awareness/timing only.

3. June

   • Harvest windowHarvest · Jun 1 – Sep 30

     Pick when fruit reaches full color for the variety and softens slightly at the tip. Japanese types ripen from early-mid summer; European plums and prunes ripen late summer into early fall. Timing shifts by variety and local season.

   • Petal-fall / shuck-fall monitoring windowSpray timing · Jun 2 – Jun 16

     Petal fall into shuck split is the timing reference many extension brown-rot and plum-curculio monitoring calendars use to begin scouting. This entry marks the window only.

     Timing window per the cited source. For product and rate guidance, consult your local Cooperative Extension and always follow the label.

   • Thin fruitThin · Jun 23 – Jul 14

     Thin heavily set Japanese plums to roughly 8–10 cm apart a few weeks after bloom to improve size and prevent limb breakage. European plums and prunes usually need little thinning.

4. October

   • Dormant-season treatment windowSpray timing · Oct 16 – Apr 14

     The dormant window before bud swell is the timing reference extension calendars use for overwintering pests and for black-knot and brown-rot management on plums. This entry marks the window only.

     Timing window per the cited source. For product and rate guidance, consult your local Cooperative Extension and always follow the label.

   • Fall cleanup and sanitationCare · Oct 16 – Nov 13

     Remove mummified fruit and rake fallen leaves after leaf drop, and prune out black-knot galls when found. Sanitation reduces overwintering brown-rot and black-knot inoculum.

Other zones and species

• Plum — zone 4
• Plum — zone 6
• Plum — zone 7
• Plum — zone 8
• Plum — zone 9
• All calendars
• Plums variety catalog