- 1). Fertilize your potted citrus tree three to four times each year. Wait until the final spring frost has passed before you begin, and then repeat the application of plant food every six to eight weeks throughout the summer, stopping around August 1. If you live in a frost-free area, it's fine to feed your tree into early fall.
- 2). Mix and apply commercial fertilizers according to package instructions. Typically, you will be measuring liquid plant food by the tablespoon and blending it with one or more gallons of water. Measure granular fertilizer correctly as well, but scatter it on the soil in your citrus pot.
- 3). Use fish emulsion or worm castings if you prefer to use an organic fertilizer. Because these substances are not as strong as chemical fertilizer, feed your citrus tree with them once each month during the summer.
- 4). Feed trees that begin to show signs of yellowing leaves with a product containing chelated iron. The condition, known as chlorosis, is a common iron deficiency that causes leaves to turn yellow between the veins. Young leaves sometimes appear yellow at their tips when they first begin to emerge. Follow the manufacturer's instructions, and repeat your application if new growth continues to be yellow.
- 5). Fertilize trees showing yellowing at leaf tips with a high-nitrogen fertilizer. Avoid using this type of food after mid-summer since it causes rapid growth, which will be tender if an early frost occurs.
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