Amur maple (Acer ginnala) is a deciduous shrub native to northeastern Asia, which can be pruned into numerous shapes, ranging from a high tree to a small bonsai.- Source.
Amur maple (Acer ginnala) is a small, deciduous shrub belonging to the northeastern area of Asia. Though native to China and Japan, it is likewise discovered in Mongolia, Korea and in the Amur Valley in Siberia. When it comes to other continents, nevertheless, it is typically considered an intrusive species.
In this guide, we will be looking into how to grow Amur maple, both outdoors and as a bonsai.
What Do Amur Maple Appear Like?
Amur maple can grow to a height of 3– 15 meters (depending upon how you prune and train them) and around the exact same width when mature with branches.
Their trunks are around 20– 40 centimeters in size, with great branches and leaves that can produce dense shade. They can turn into a strong, robust shape with a dominant main branch and other smaller branches if pruned when young.
They have thin branches with thin bark that is greyish-brown in colour. The bark is smooth in young plants, becoming fissured or vertically grooved as the plant matures.
The leaves have three lobes each, where the middle lobe is generally longer than the side lobes. The leaves are 4– 10 cm long and 3– 6 cm large.
The lobes have twice as serrated (toothed) margins. The upper surface of the leaf is glossy.
The Amur maple leaves on this tree are turning a crimson in autumn.This image reveals flowers prospering on an Amur maple as the leaves begin to turn brown.This image reveals the design of an Amur maple leaf and its samara.
What You Must Learn About Amur Maple.
Amur maple are the most cold-tolerant of all maple and can grow in USDA strength zones 3 to 8.
Throughout autumn, the green leaves turn bright yellow, orange and red, with 3– 5 cm long petioles (stalks of the leaf) that are primarily pink in colour.
The imbricate buds and flowers are creamy white or light yellow-colored green and range from 5– 8 mm in size. They are produced throughout the spring around the month of May, together with the leaves. The hermaphroditic and fragrant flowers grow in clusters known as panicles.
The seeds can be found in reddish-brown or green-winged samara that are 8– 10 mm long with a wing of 1.5– 2 cm. (Samaras are dry fruits that have one seed surrounded by papery tissue, which assists the seed catch the wind.) The fruits of Amur maple fully grown in late summertime or early autumn.
They have a shallow, fibrous root system.
They are small trees that grow in areas where there is complete or partial sunlight, as they are shade-tolerant. They grow best in damp, well-drained soil with a pH level between 6.1 and 7.5, tolerating alkaline soil but low levels of salinity.
They grow really slowly and lose their leaves every year during the fall. The brand-new leaves grow back in the spring.
How to Grow Amur Maple From Seed.
Although growing from seeds is a perfectly fine way to begin your Amur maple, it’s worth keeping in mind that trees grown from seeds do so very slowly and have low vigour in contrast to trees grown from cuttings.
Harvest the Seeds Fresh.
Collect the seeds when they are completely mature. Do not let them dry and produce any germination inhibitors.
Pick fresh seeds and prepare them by soaking them in water for a day or 2. After soaking, stratify the seeds for one to four months in an airtight bag at 1– 8 degrees Celsius. They need to begin to grow during this procedure.
Note: Seeds collected during October or November ought to be ready to be planted the following March or April.
Sow Seeds Just After the Frost Is Over.
Sow these seeds in a seedbed throughout the spring or early summer season, however only after the frost is over. They ought to grow totally in 2 to 4 weeks, depending on the temperature. It is best to have them in a warm location with partial sunlight. Keep the soil moist, however do not overwater.
If not soaked or stratified, however, seeds will not sprout for about a year. Only once they have germinated can they then be transferred to a nursery bed.
Make Certain the Seeds Are Mature.
It’s important to ensure that the seeds are totally mature, as immature seeds will either not sprout or will produce really weak plants. Also remember that maple grown from seed will not necessarily grow true to the kind of the moms and dad tree (frequently due to cross-pollination).
How to Grow From Cuttings.
In order to get a true-to-type plant that has the very same qualities of the primary tree, you can grow Amur maple from cuttings. Young, healthy shoots of the tree that have 2 or three pairs of leaves and one set of buds on the base need to be cut throughout June or July. Seal the cuttings in a plastic bag to prevent moisture loss. Make certain that the shoots do not wilt.
Cut the cutting by eliminating the lower leaves, however keep three to four pairs at the top. If required, you can apply rooting hormonal agent to the cutting to enhance rooting.
Insert the cuttings into a rooting medium. They ought to root within two to three weeks and can be potted soon after.
How to Grow Amur Maple as a Bonsai.
Amur maple can often succeed as a bonsai and can be grown either from seeds or from cuttings utilizing the methods above.
What Do Bonsai Requirement to Grow Well?
Bonsai can grow in clay, loam and sand. They tolerate acidic or alkaline soil, however need the soil to be well drained pipes. It’s likewise crucial to keep an eye on the pH levels.
These bonsai need more watering throughout summer season heat– in some cases 2 to 3 times a day to prevent drying of the leaves– and less throughout winter season.
They also need to be fed weekly throughout the first month after leafing. After this very first month, they can then be fed every 2 weeks. You can utilize bonsai fertilizer or half-strength plant food.
How to Prune Bonsai.
When the trees are young and fully grown enough with a couple of branches, you can prune them to the preferred shape. The very best time for pruning is throughout early spring when the buds form. Amur maple can be cut near the bar. Shoots that are around 6 cm can be cut to keep the dwarf size of the plant.
Since these types bud well on old wood, they can be cut back rather hard. The leaves can be defoliated every two years during mid-summer. Any brand-new shoots that grow must be pruned. Pinch off big leaves all throughout the growing season.
How Do You Repot Bonsai?
Repotting should be done in early spring before buds come out. Young trees need repotting every year at first but can soon be repotted just every 2 years. Mature older trees can be repotted every 4 to 5 years, however it is finest not to have the older trees bare-rooted. It’s likewise crucial to make sure you don’t both repot and defoliate in the same year.
You can likewise wire the tree to get preferred shapes, however that requires security of the bark. Wire the tree when it is dormant in fall, and utilize a wrap to protect the bark. Do not leave the wire for extended periods of time, as it will scar the bark.
When Should You Transfer to Soil?
If you purchased an Amur maple from a nursery, plant dealer or garden centre, you must await the tree to be a minimum of 20 cm tall prior to you plant it completely in the soil.
This also applies to trees grown by all the above techniques and any Amur maple still in a container.
Where Should You Plant Your Amur Maple?
Select a place that has acidic or neutral-pH soil and full sun (or a minimum of only partial shade). Ensure that the soil is able to both retain wetness and drain well.
Do not plant them crowded together, and leave a minimum of 10 feet between each shrub. Pick a location where the plant will have area to spread its branches and free-root.
Plant the shrub away from walls, decks and constructing foundations in order to prevent blocking windows, roofs or power lines.
How to Plant in Soil.
Ensure that the plant is mature enough to be moved to the soil prior to following these steps:.
Dig a hole in medium-coarse soil that is 2 feet deep and 2 feet wide. Mix in some garden compost or peat moss with the soil you dug out.
Tap the container as you remove the plant to loosen the soil.
Set the plant in the hole. Gently loosen up the roots with your fingers if they are tightly packed. If the rootball is covered in jute fabric (when it comes to nursery-bought plants), it needs to be gotten rid of, along with any strings or wires that protect it. Otherwise, these will prevent the roots from growing freely into the soil.
Now fill the hole with the compost-enriched soil, and pack it firmly around the root ball. Fill soil to the level of the plant where roots start to branch out from the primary stem.
Water the plant, and lay some mulch a minimum of 10 cm far from the main trunk or stem of the plant to maintain wetness.
Examine Soil Levels Often.
It is necessary to periodically check in on the acidic or alkaline levels in the soil, as extremely alkaline soils can cause the tree to establish iron chlorosis.
Just how much Should You Water the Shrub?
Plants’ varying requirements for water depend on the season, however deep watering is advised. It assists the roots grow much deeper and makes the plant stronger and more drought-resistant.
Examine the soil moisture level with your finger. If you don’t feel wetness as much as a depth of 2– 4 inches, then it requires watering.
The new plants require to be monitored by doing this for a minimum of 2 years before they will be huge enough to survive by themselves.
Keep in mind: It’s likewise a great concept to fertilise your Amur maple once every two or three years throughout the early spring season when they start to bud.
How to Prune Amur Maple.
The pruning procedure differs depending on size and shape, however all plants need dead branches got rid of to boost healthy and thick development of the plant with more flowers and leaves.
You can train the tree as it grows according to your need by pruning to a little tree or a tall shrub.
Dead branches need to be gotten rid of near the trunk, along with the bark. Pruning other branches need to be done above a leaf bud at a small angle. New branches grow from the bud below the cut.
Some shrubs can be sheared to form hedges.
Tools like hand shears, pruners and loppers are utilized for shrubs. Pole pruners and saws are used for huge trees.
If you feel that you can not safely prune a tree, please call an expert pruner to do the task.
Keep in mind: Ensure you use sharp and tidy tools to prune. Careless pruning can lead to damage and infections.
Like other trees and plants, the Amur maple is susceptible to pests and illness. I’ve also composed another short article on this fantastic shrub that details how to combat these problems. It also includes different other usages and truths associating with Amur maple.