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John Fulton

John Fulton
Former County Extension Director

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In The Backyard

Horticulture columns and tips done on a timely basis
leaf scorch

Effect of dry weather and heat on perennials and leaf scorch

Posted by John Fulton -

Perennials are also suffering during this extended dry period. There is evidence of scorch on recently transplanted trees, shrubs, and other perennials. This is the fancy name for the condition I mentioned in lawn grasses where the plant just can't take up enough water to supply the leaves. In trees and shrubs, it causes them to suddenly have brown leaves. It is a good idea to water perennials (flowers, shrubs, trees, etc.) with an inch of water a week. You can use a sprinkler and catch water in a can to tell how much an inch is. As for using the deep root feeders/waterers, most roots that take up water and nutrients are in the upper foot of soil, so broadcast applications with a sprinkler or watering wand are probably most effective and easier to apply.

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