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Yews are popular evergreen shrubs that add beauty and structure to gardens. However, like all plants, they can suffer from nutrient deficiencies that affect their health and appearance. Recognizing the signs early can help you take corrective actions to keep your yews thriving.
Common Nutrient Deficiencies in Yews
Nitrogen Deficiency
Nitrogen is essential for healthy foliage. A deficiency often results in pale, yellowish-green leaves and poor growth. Older needles may turn yellow first, with new growth appearing stunted or sparse.
Iron Deficiency
Iron deficiency causes chlorosis, where leaves turn yellow while veins remain green. This typically affects new growth and is common in alkaline soils that hinder iron absorption.
Magnesium Deficiency
Magnesium deficiency manifests as interveinal chlorosis on older needles, leading to a mottled appearance. Over time, needles may drop prematurely, weakening the plant.
Signs to Watch For
- Yellowing or pale foliage
- Stunted growth
- Premature needle drop
- Uneven coloration
- Weak or sparse new growth
How to Confirm Nutrient Deficiencies
Soil testing is the most reliable way to determine nutrient deficiencies. It helps identify pH levels and nutrient content, guiding appropriate amendments. Visual symptoms alone can be misleading, so testing is recommended for accurate diagnosis.
Corrective Actions
Applying Fertilizers
Use a balanced, slow-release fertilizer formulated for evergreens. For specific deficiencies, apply targeted supplements such as iron chelates or magnesium sulfate as recommended.
Adjusting Soil pH
If soil pH is too high (alkaline), incorporate organic matter or sulfur to lower pH and improve nutrient availability. Consult a soil test report for precise adjustments.
Preventative Care
Regular fertilization, proper watering, and soil testing help prevent deficiencies. Mulching can also maintain soil moisture and temperature, creating optimal growing conditions for yews.