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What Is The Best Fertilizer For Thuja Plants?

The evergreen thuja hedge requires little care as long as it has enough nutrients. Here we explain when and how to use thuja plant fertilizer

Arborvitae, also called Thuja, is a cypress species in the Cupressaceae family. In addition to being robust, evergreen, and quite demanding, these conifers with scale leaves do not require much maintenance. Generally, they act as a year-round hedge in gardens, making them welcome guests. However, planting a thuja hedge in a narrow space causes the roots to fight for nutrients. Therefore, it is extremely important to fertilize appropriately. Otherwise, only the strongest plants will survive, and your green leaf walls will have unsightly gaps.

A hedging plant like Thuja is very popular because it offers everything that makes a good botanical privacy screen. The leaves quickly form opaque walls all year round and are extraordinarily hardy. They can provide these advantages if they have an appropriate selection of high-quality nutrients. However, Thuja cannot use its full potential if it is not robust enough. It is important to know when, how often, and which fertilizer to use to make your thuja hedge lush and green. You can find all the details about fertilizing Thuja here.

What Fertilizer Should Be Used For Thuja Plants?

The six main types of fertilizers sold for thuja plant fertilization are listed below.

Water-Soluble Fertilizers For Thuja

Watering cans, or hosepipe mixers that fit on the end of your hose, is the place where you can add a few teaspoons of these fertilizers to water. These trees produce quick growth, especially in newly planted trees with small root zones. So, they are a good choice for the first couple of seasons. Then, to avoid burning the roots, you can dilute them before application, so they don’t last long in the soil. After that, you need to apply the fertilizers frequently. After using it in the first season, you may switch to another type of fertilizer that is easier to use.

Granular Thuja Fertilizers

The grains are usually different colors, and they look like fine gravel. Mix them into the soil when planting or scatter them over the surface around established plants. To stimulate root growth in your young plants, use a fertilizer with high phosphorus. During the preparation of the planting area, you should blend this into the soil. Over the next few weeks, your plants will receive slow and steady feedings of nutrients.

Slow-Release Thuja Fertilizers

In general, these look similar to gravel. However, all the slow-release fertilizers usually have the same color. This type of fertilizer is usually a blend of nutrients wrapped inside a coating material, which releases nutrients over several months. For a low-maintenance garden, they are great since you only need one application per season.

Fertilizer Spikes

They are spike-shaped fertilizers that you can hammer into the ground gently. The plants will receive nourishment as they slowly dissolve. Keep them away from your plants’ trunks and follow the spacing and number recommendations. Apart from using these spikes for your plant, you should buy plants online to get the best possible quality.

Mineral Fertilizer

If the dosage is right, you can also provide mineral fertilizer to your thuja hedge. You can apply these organic fertilizers once a year in the spring with plenty of water. The thuja plants need a dose of about 50 grams per square meter. Your thuja hedge will benefit from its magnesium content. It is best to distribute mineral fertilizers over the vegetation phase to reduce the risk of overfertilization and maintain nutrient availability. Fertilization occurs two to three times between spring and mid-June in small amounts. It is much more environmentally friendly to use organic fertilizers. 

Using patent potash fertilizer in autumn hardens the shoots that have formed over the year. To prepare your thuja hedge for the frosty weather, fertilize it with about 40 grams per square meter at the end of August. Magnesium strengthens your evergreen shrub even further.

Epsom Salt Fertilizer For Thuja Plants

The process of building up chlorophyll requires a lot of energy. The leaf pigments are responsible for ensuring the color of the leaves. The function of photosynthesis is also dependent on them. For plants to build chlorophyll, magnesium is essential. In summer, when photosynthesis is at its peak, it is recommended to give magnesium fertilizer to evergreen plants such as Thuja.

Your Thuja can receive this nutrient from Epsom salt. In addition to ensuring lush greenery, nitrogen-magnesium fertilizers like Epsom Salt fertilizer enhance the plant’s resistance to adverse weather conditions. Generally, you can give around 15 to 30 grams per square meter, depending on the soil type. You should apply more to barren soils and lighter soils.

When To Fertilize Your Thuja Plant?

You should feed your plants in the early spring, just before new growth begins. Always follow the instructions on the packet to determine how much to use per plant or square foot. Fertilizer in excess is worse than none at all. You should apply it evenly under your trees and a few feet out, where your trees’ roots are active and growing. Use plenty of water-soluble feed and allow it to soak into the root zone.

Closing Words

The type of fertilizer you choose does matter but what matters most is the method and frequency of application. With the right fertilizer program, you’ll be sure to have the fastest-growing and healthiest Thuja Green Giant trees. In the end, you should also ensure that the thuja plant is of the best quality.

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