Its late-winter to early-spring flowers produce July plums of brilliant red. Learn how to grow and care for them and discover 6 common varieties. Composed of copper sulfate, lime, and water, it protects the tree against fungicide and bacteria. Plums are unique in that they need high heat hours to grow, but only low chilling hours to start flowering. 113-117 Dryden Road, Ithaca, NY 14850. Sulfur Fungicide is used for the prevention of rusts, powdery mildew, black spots, and leaf spots. Prunus Cerasifera Nigra / Black Cherry Plum, 2ft Tall In 5L Pot, Purple Foliage. Copyright © Gardenerdy & Buzzle.com, Inc.