What is thuja tree?
Thuja, or arborvitae is a coniferous tree native to Asia and North America. Because of the versatility of those trees, they are used worldwide as garden plants. They can be planted in groups as well as a single, individual plant. Thuja has a lot of varieties which can be useful for various conditions. Such a wide choice provided by those plants is the main reason for their popularity among gardeners.
Many types of thuja trees are exceptionally resistant to any conditions. They are easy to take care of and most of the species are evergreen. A thuja tree can be grown in a flowerpot, hence it can grow not only in the garden, but also on a balcony, a terrace or a patio. Any shorter variety can be used as a shrub, for instance in a rock garden.
Thuja trees are not very complicated to take care of. One should, however, learn a few basic facts, for instance when to plant a thuja, what type is the best for a shrub and how to take care of specific varieties, such as thuja green giant.
Which type of thuja should I choose?
There are a few types of arborvitaes and each of them differs by their specific requirements. Before choosing a particular one, one should consider which of them will suit their needs the best. The most common types of thujas are:
- Eastern arborvitae - also known as thuja occidentalis. This type of plants prefers alkaline, high Ph soils. Most of the varieties are frost resistant and immune to pollution, however they should be shielded from cold wind and droughts. This type of thuja grows well in sunny spots, however some varieties prefer shade. When purchasing such a shrub it is good to learn about its individual needs, for instance when is best to plant the thuja.
- Giant arborvitae - the most popular variety of this type is thuja green giant. Its needles have dark green colour. The tree can grow very high, however there are also smaller, shrub varieties. Young seedlings are vulnerable to cold temperatures, therefore they need to be planted in warm and sunny spots. Giant thuja is more resistant to droughts than the eastern type.
- Chinese thuja - also called oriental arborvitae. This type is native to Asia. Because it is very vulnerable to cold temperatures, it is rarely chosen for colder regions. This kind of shrub grows quite well in warm zones. it requires warm and sunny spots. Its advantages are high resistance to droughts and good tolerance of different types of soil.
The best shrub to build hedges is eastern thuja.It does not grow too rapidly - about 30 centimetres a year. It develops few cones and has quite a regular shape. An oriental thuja, on the other hand, will not form a very high shrub (it reaches about 1 metre), therefore it’s perfect for a rock garden.
Planning a composition, it is best to choose plants of various sizes and shapes. One needs to take the conditions in their own garden into consideration, as well as the type of soil where the thujas are going to grow. If you are wondering if you can plant thuja green giant or use an oriental thuja for a shrub, it is best to ask the sales person in the flower shop.
Thuja tree - how to pick the best seedlings
When purchasing a thuja, pay a special attention to the state of the seedlings. Do not buy withered or damaged ones, with broken roots or eaten by vermin.
The best thuja for a shrub is the short variety, seeded in a container. Such plants are more expensive, however they have bigger chance to survive in a new environment. When buying a tree, examine closely the underneath of the pot:
- If the roots break through, the plant has not been watered for a long time.
- Do not buy a thuja if you noticed that some roots had been cut. It means that the plant was not grown in the pot, but it was potted quite recently.
If you decided to choose a balled and burlapped plant, pay close attention to the roots. The soil around them should be dense and not too dry. Do not purchase trees whose roots volume is unproportionally small to the volume of the rest of the plant. Such thujas are very likely to wither after planting them in your garden.
When to plant thujas?
One of the most common questions when picking any type of plant, is when to plant them. Thuja trees that have been grown in containers can be planted all year long from early spring (mid-April) to late autumn.
The best time to plant a thuja is early spring and late summer. Planted in spring, a shrub has time to acclimate and prepare for heat waves in summer. In contrast, if you plant your thuja in August or September, it will get ready for winter. Do not plant your shrub later than six weeks before the first freezes.
Balled and burlapped thujas should be planted in April or from mid-August to mid-September. Plant them immediately after the purchase, before the roots get dry.
Thuja tree - how to plant shrub?
The soil in which the shrub will grow should be fertile, loose and damp. Barren, dry soils will cause the plants to wither and their needles will become brown. One needs to pay attention to the needs of particular types of thujas - each variety needs a different land. You might also purchase a potting soil mix prepared specifically for conifers. You can also mix composted pine bark with peat moss.
The spot for planting needs to be prepared accordingly. Get rid of all the weeds within 30-40 cm radius. For a hedgerow, weed out a 60 cm wide strip of land. Dig out a hole or multiple holes - they should be 2-3 times longer and wider that the root ball of your thuja.
How far apart to plant thuja trees?
If you want a dense hedge, plant your thuja trees every 60 cm. If you plant them every 80 cm, they will form a row of trees. Make sure to keep a distance from the fence (around 50-60 cm). It will allow the plants to grow freely. Thuja green giant will form a high hedge which is quite a useful decoration for any garden. It protects your house from noise, wind and pollution.
Fill the holes halfway with the soil mix (either purchased at store or the one you prepared yourself). Then all you need to do is:
- Place the plant vertically and cover the roots with soil.
- Fill the hole with water and once it soaks into the ground - refill it with soil.
- Even the surface and water the plant again.
- You can put a garden foil and tree bark on top of the ground - it will prevent the water from evaporating.
How to take care of thuja trees?
You need to take a proper care of your newly planted thuja trees, so that they grow well and do not wither. Young thuja trees don’t have long enough roots to draw water from the deeper ground. For this reason you need to care for them properly.
During the first weeks the plants should be watered regularly - mornings or evenings. If your shrub is exposed to heat waves and droughts, spray its needles with water. Do it before sunrise or after sunset, so the sun doesn’t burn the plant. In case of strong winds stake higher plants with bamboo or wooden sticks.
If you decide to plant thujas, it is worth to buy a mycorrhizal inoculant and apply it as soon as you plant the trees. Such procedure makes it easier for your plants to draw water and nutrients from the ground. It saves a lot of time and money spent on the plants later. One should start feeding the plants in spring and finish around mid-July.
You can use general purpose fertiliser, as well as plant food made specifically for conifers. From August to September you may use special autumn fertiliser which is low in nitrogen.
You can prim your shrub from spring to mid-summer. It is especially important for hedges. The last trimming should be performed in August so that the branches don’t die during first freezings.
Thuja trees usually are not difficult to take care of. For this reason gardeners choose this type of shrub for their gardens. Thuja green giant trees are perfect for hedges, but also for making compositions. You should take care of your thuja as soon as possible so it grows well and looks great for a long time.
A shrub for your garden - FAQ
📍 When to plant thuja green giant?
The best time to plant thuja trees is between early spring and late autumn. The only exception are balled and burlapped plants - the latest time they can be planted is mid-August. Do not plant your trees later than 6 weeks before the first freezes.
📍 How to plant thuja green giant?
Thuja trees should be planted in holes at least 2 times bigger than the root ball. The bottom of the hole should be layered with conifer soil. Plant the trees vertically and water them afterwards.
📍 Where to buy thuja tree?
Thuja trees can be bought at any florist shop. You can also purchase the shrub online or search for a nursery in your area.
📍 How fast do thuja green giants grow?
Thuja green giant can grow around 1 metre per year. At this rate a small shrub becomes a tree very quick. Because of its fast growth, thuja green giant is perfect for planting a dense hedge.