Thuja Occidentalis Smaragd Problems

The Thuja Occidentalis ‘Smaragd’, often known as the Emerald Green Arborvitae, is a popular choice for hedging and ornamental purposes. Its bright green foliage remains consistent throughout the seasons, offering an evergreen appeal to landscapes. However, like any plant, the ‘Smaragd’ can occasionally exhibit concerning signs. Let’s delve into some common problems faced by gardeners and their potential solutions.

1. Browning in Autumn/Winter:

Contrary to the belief that these conifers should retain their vibrant green hue all year round, some gardeners observe a tinge of brown during the colder months. This change can be unsettling, especially for those expecting consistent evergreen foliage.

Possible Causes:

• Watering Issues: Despite being in areas with heavy rainfall, pot-grown conifers, including the ‘Smaragd’, can suffer from drought during their initial years. The reason? Their rootballs may not receive sufficient water, thereby affecting their health.
• Soil Type: Heavy clay soil can sometimes lead to poor drainage and may not provide optimal growing conditions for the ‘Smaragd’.
• Pests or Diseases: Browning can also result from mites or other pests, or it might indicate a lack of essential minerals in the soil.

2. Tips for Healthy Growth:

• Consistent Watering: Especially during the tree’s formative years, it’s crucial to ensure that its rootball is kept consistently wet. This practice can promote healthy growth and reduce the chances of drought stress.
• Soil Improvement: For those planting in heavy clay soils, consider improving the soil structure by incorporating organic matter or compost. This amendment can enhance drainage and provide the tree with necessary nutrients.
• Avoid Early Intervention: If you’ve recently planted your ‘Smaragd’, refrain from using any fertilizers or treatments during the first year, as it can sometimes do more harm than good.
• Dieback Awareness: It’s worth noting that a certain amount of dieback isn’t uncommon with Thujas. Hence, a small amount of browning or loss of foliage shouldn’t be an immediate cause for alarm.

Conclusion:

While the Thuja Occidentalis ‘Smaragd’ is indeed hardy and known for its consistent color, understanding its needs and being patient, especially during its initial years, can go a long way in ensuring its health and longevity. Browning tips are often a temporary phase, and with proper care, your ‘Smaragd’ should flourish in the subsequent seasons.