- Trees - Fertilize trees just as their leaves begin to die off. At this time, trees are rapidly moving food reserves into their root systems. An extra helping of a slow release fertilizer, which won't burn roots, helps trees survive the winter and begin growth in the spring. A slow release organic nitrogen fertilizer such as 6-2-0 allows this safety. Choose products that also contain a high amount of organically complex iron, which helps trees, overcome early spring yellowing. This is especially noticeable with many maple trees.
- Lawns - Lawns also need to be fertilized. This keeps them in good condition so their roots are full of reserves for winter and early spring. Another late fall fertilization after the lawn quits growing but before freeze-up gives grass the nutrients it needs to survive the winter. Research at the University of Wisconsin indicates that northern lawns continue to need nutrients even when they are not actively growing. Starving lawns during early winter sets the stage for winterkill. Southern lawns are trickier to fertilize in the fall. Even though southern lawns benefit from a fall application of fertilizer, don't fertilize these lawns within 30 days of dormancy. If you fertilize too late, you will encourage growth when they should be entering dormancy. This causes winterkill. According to Dr. George Snyder, professor emeritus at the University of Florida, "Use a fertilizer high in iron, such as 6-2-0. This keeps your lawn looking nice and green without causing excessive growth. This green stays on even when lawns are not actively growing."
- Other perennials - Fertilize other perennials such as forbs (broad-leafed herbaceous plants) and shrubs in the fall. This helps them accumulate food reserves in their roots, getting them ready for winter and early spring startup.
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