\u00a9 2023 wikiHow, Inc. All rights reserved. If your kale leaves are showing signs of bacterial disease, you can also spray them with liquid copper. ALL RIGHTS RESERVED. If you have a plant with purple leaves, it may also be due to elevated levels of anthocyanin, which is a purple-colored pigment. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. REDBOR KALE: The stunner of the bunch, Redbor kale has dramatic purple tightly frilled leaves and a mild, crisp flavor. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Many people think they should douse their seeds with a ton of water so they can grow faster. Using a thick layer of mulch around the stalks can help trap water and nutrients into the soil. .slick-slider#wpsp-83657 {margin-left: 0px; }.slick-slider#wpsp-83657 .wp-show-posts-inner {margin-left: 1em; margin-right: 1em; }#wpsp-83657.wpsp-card .wp-show-posts-single {margin-bottom: 2em; }.slick-slider#wpsp-83657 .wp-show-posts-single {margin-bottom: 0px; }#wpsp-83657 .wp-show-posts-inner {background-color: #ffffff; }#wpsp-83657.wp-show-posts .wp-show-posts-entry-title {font-size: .9em; }.wp-show-posts-columns#wpsp-83657 {margin-left: -2em; }.wp-show-posts-columns#wpsp-83657 .wp-show-posts-inner {margin: 0 0 2em 2em; } Nitrogen (N) deficiency appears as a general pale yellowish-green plant with slow growth and reduced tiller development. You end up with pale, thin stems and few leaves. Some of these links may be affiliate in nature, meaning we earn small commissions if items are purchased. 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