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InsightHorizon Digest

Do Mature trees need fertilizer

Author

Andrew Mccoy

Updated on March 28, 2026

As a tree gets older, it needs less and less fertilizer to stay healthy. They will still need a bit of fertilizer throughout the year. Consider doing a soil test to determine how much phosphorus and potassium your tree has. That will help you decide how much fertilizer it needs.

When should I fertilize my established tree?

For all trees and shrubs. If needed, the best time to fertilize is late April or early May, or late fall once plants are dormant. The recommended fertilizer should be spread evenly across the soil surface. The amount of actual nitrogen applied should be 3 pounds per 1,000 square feet.

Should you fertilize trees every year?

Ideally, growing trees should be fertilized throughout the year but a bit differently as trees age. A tree needs larger amounts of nitrogen (N) based fertilizer during the growing season. Nitrogen-based solutions should be applied during the early spring and summer months.

Can you feed mature trees?

Old trees. Established trees don’t usually need feeding, but if new shoots are sluggish (less than 10cm over the growing season) or the foliage paler than expected, then you might want to consider an application. Once the tree is mature, growth will slow down, so feed is only recommended to remedy nutrient deficiency.

Should you fertilize mature oak trees?

Fertilization. A healthy, mature oak under natural conditions does not require supplemental feeding. The leaf litter and other organic debris on the soil supply nutrients as they decompose and release nutrients to the soil and roots. … Generally, young trees can be fertilized to establish them quickly.

How often should you water mature trees?

Plan to water mature trees 1-2 times a month. Based on the amount of rain and heat levels in your region, this may vary. And, it’s always smart to water more often when there is a drought. To see if your tree needs water, poke a long screwdriver into the dirt—if it’s hard to push in, water.

Can you fertilize a tree too much?

The Effects of Excessive Fertilization on Trees You can actually kill a tree if you apply too much fertilizer. Applying high levels of quick- release nitrogen can burn the roots when applied to the soil and can burn the foliage when applied as a foliar spray or drench.

How often should you trim mature trees?

Generally, most mature trees need to be trimmed every 3-5 years while a younger tree will need it every 2-3 years. A fruit tree should be pruned yearly while some evergreens can go many years without needing a single cut.

Do Mature trees need pruning?

Trimming a mature tree is usually done for one of three reasons: to thin the canopy to allow in sunlight, to raise the canopy to allow for foot or vehicle traffic below, or to make the tree canopy shorter. When performed improperly, pruning can make a mature tree unstable or harm its health and appearance.

Where do you put fertilizer on trees?

Just spread the granular fertilizer on the ground evenly around the edge of the tree’s canopy (dripline). Do not put fertilizer within one foot (minimum) of the trunk. For trees growing in turf, fertilizer is best applied beneath the root zone of the grass.

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How do you keep mature trees healthy?

  1. Plant the right tree. This is the first, and one of the most important steps in making sure you get years of enjoyment from any tree. …
  2. Remove stakes early. …
  3. Keep the grass away. …
  4. Water properly. …
  5. Fertilize when needed. …
  6. Mulch. …
  7. Prune properly. …
  8. Protect the roots.

Do mature trees still grow?

Like other animals and many living things, we humans grow when we’re young and then stop growing once we mature. But trees, it turns out, are an exception to this general rule. In fact, scientists have discovered that trees grow faster the older they get. Once trees reach a certain height, they do stop getting taller.

Which trees mature grow faster?

  • Hybrid Poplar. A very fast-growing tree, up to 5 to 8 feet per year. …
  • Weeping Willow. …
  • Quaking Aspen. …
  • October Glory Red Maple. …
  • Arborvitae Green Giant. …
  • River Birch. …
  • Dawn Redwood. …
  • Leyland Cypress.

What fertilizer do trees like?

As a result, trees usually respond best to fertilizer with a 2-1-1 or a 3-1-1 ratio (nitrogen-phosphorus-potassium). Commonly available fertilizers with a 2-1-1 or similar ratio are 18-6-12, 12-6-6, 10-6-4, 10-8-6 and 10-8-4.

Are trees worth fertilizing?

Often there is adequate phosphorus in soils from previous fertility. Trees planted in a lawn will benefit from the same fertilizer as put on the lawn, so if you have fertilized the lawn last spring or early fall, there is probably no need to fertilize trees planted in it.

Can lawn fertilizer be used on trees?

Lawn fertilizer that includes weed killer is often dangerous for your trees. Applying it to the lawn above a tree’s root system could seriously harm and ultimately kill the tree. … Broadleaf herbicides can cause tree leaf discoloring or curling, branch death or complete tree death.

Is it better to water trees in the morning or evening?

The best time to water is in the morning or evening, so the roots have a chance to absorb most of the water. … Newly planted trees require much more water than established ones. The best way to determine when trees need water is to check the soil.

What is the best way to water mature trees?

  1. Water established trees and shrubs with overhead sprinklers.
  2. Apply a deep watering over the entire root zone area until the top 6 to 9 inches of soil are moist.
  3. Avoid light watering as this promotes shallow root systems that are susceptible to summer heat and drought stress.

How can I make my tree roots grow deeper?

Deep watering solves these problems. You use less water while ensuring it gets to the tree roots. Plus, deep watering encourages trees to grow a deep root system, which helps keep it anchored during strong storms and winds.

What happens if you prune a tree at the wrong time?

Most importantly, if you make pruning cuts at the wrong time–even good cuts that avoid the most common mistakes described here–you risk leaving your plants and trees susceptible to disease pathogens that are airborne or transmitted through insects.

What time of year should trees be cut down?

While a tree or stump can be removed any time during the year, the best time for removal is during winter. Here’s why winter is the best time: Reason 1: Trees that have decaying or dead branches become more of a risk during winter.

Is it OK to trim trees in the summer?

In general, pruning a tree when it is dormant is recommended if there are large branches to remove; that is, pruning between the time the leaves fall from the tree in the fall and the time the buds swell in the spring. … If, for safety reasons, you must do the pruning in the summer, do it.

Can you prune trees too much?

Over time, continued over pruning may lead to branches that are too weak to tolerate wind or ice loads, or the plant may simply exhaust itself trying to replenish its canopy. … So, although pruning may not kill your plant directly, over pruned trees and shrubs can die as a long term result of the associated stress.

How much of a tree can you prune without killing it?

If a tree repeatedly loses too much of its canopy at one time, it can become weak or even die from the stress. That’s why you shouldn’t trim more than 25% of a tree’s canopy at one time.

Why are my mature trees dying?

Moisture issues are commonly the reasons why a tree is prone to dying. Mature trees can be adversely affected by too much or too little water. Dehydration can kill all living beings – humans, animals, and trees. To ensure your trees grow healthy and sturdy, make sure that they are properly nourished.

Why are mature trees good?

Trees Save Energy and Benefit the Environment In the winter, deciduous trees that have lost its leaves let sun filter through and warm buildings and homes. By carefully positioning trees, you can save 25 to 35 percent in energy consumption per year. Trees also make a tremendous difference to communities at large.

How long do old growth trees take to mature?

Depending on the forest, this may take from a century to several millennia. Hardwood forests of the eastern United States can develop old-growth characteristics in 150–500 years.

Can you plant mature trees for privacy?

Lawson Cypress (Chamaecyparis lawsoniana) Hardy down to -20 degrees F, this low-maintenance tree is one of the best trees for privacy. The evergreen foliage is soft and lush. Lawson’s cypress grows very large. It’s well over 40 feet at maturity with a 20 foot spread (though in the wild it grows much larger).