Are your evergreens turning yellow or brown? The symptoms could indicate a problem, but chances are they’re just part of the trees’ seasonal aging process. Close examination will reveal the cause – and whether any action is needed.
Many healthy evergreens regularly experience yellowing and browning of older branch parts during autumn. The trees will drop affected needles later in the season, which often panics their gardeners.
But if the symptoms present only on the innermost branches and on both the upper and lower sections of the tree, there’s probably nothing to worry about. It’s a normal part of the aging process.
Evergreen trees can experience browning for various reasons, and determining whether it's normal or a problem depends on the extent and specific circumstances. Here are some common causes of evergreen browning and how to assess the situation:
Seasonal Needle Shedding:
Normal or Not a Concern: Evergreens naturally shed some older needles each year, typically in the fall or spring. This is part of their normal growth cycle, and it's not a cause for concern unless the browning is excessive.
Drought Stress:
Problematic: Lack of water can cause evergreen needles to turn brown. If the browning is widespread and the soil is dry, it may indicate a watering issue.
Root Issues:
Problematic: Poor soil drainage, compacted soil, or damage to the tree's roots can lead to browning. Check for signs of root rot or damage.
Pests and Diseases:
Problematic: Insect infestations or diseases can cause browning. Look for unusual spots, webs, or signs of pests on the tree.
Winter Damage: Normal or Not a Concern: Exposure to harsh winter conditions, such as cold winds and extreme temperatures, can cause browning. In some cases, the affected areas may recover in spring.
Improper Planting or Site Conditions:
Problematic: If the tree was planted incorrectly or is in an unsuitable location, it may suffer stress and exhibit browning. Check if the tree is planted at the right depth and in well-draining soil.
Nutrient Deficiency: Problematic: Lack of essential nutrients, especially nitrogen, can cause browning. Consider soil testing to determine if nutrient amendments are necessary.
How to Assess:
Examine the Entire Tree: Look for browning throughout the entire tree or just in specific areas.
Check for Other Symptoms: Look for signs of pests, diseases, or environmental stress.
Soil Moisture: Check the soil moisture. If it's consistently dry, the tree may need more water.
Inspect the Needles: If the browning is limited to older needles, it might be normal. If new growth is affected, there may be a more serious issue.
If you're uncertain about the cause of browning or if it's severe, consider consulting with a local arborist or horticulturist. They can provide on-site assessments and recommend appropriate actions based on the specific conditions affecting your evergreens.
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