The root system is the key to a healthy tree. The soil that surrounds the roots directly affects their quality.
QUICK ANSWER: The best soil for Japanese maple is a loose and nutritious mix. It is also essential that the substrate is well-drained and slightly acidic. To get such a soil mix, add 1-2 buckets of soil conditioner to the native soil.
Read also: Acer Palmatum Care Guide.
Soil requirements
In general, Japanese Maple can adapt to a wide range of soils. So, in most cases, you don’t need to do anything to your soil.
But if you want to give your maple a good start, it is a good idea to improve the native soil. The best material for improvement is organic matter.
You can use soil conditioner, compost, or peat. All these materials work equally well as long as they are of good quality.
Dig a two to three-times larger planting hole than the maple’s root system. Mix the soil you got out with one bag of organic matter. Then, plant the maple using this mix.
Clay soil
Clay is not a good growing medium for Japanese Maple. This soil type can hold water for too long, and Japanese maples do not like wet feet.
Clay soils are prevalent on the planet. If you have loam or something similar, you’re fine. But if you have pure clay in your yard, it needs to be improved. You can do this by adding the organic matter.
Additionally, you can make drainage to avoid wet feet. To do this, dig a planting hole three times deeper than the root ball and fill it one-third with stones when planting the maple. Then, plant the maple there.
Also, avoid planting Japanese maple near the house or other buildings. This is to prevent water from the roof from getting to the roots. Planting the tree very close to a pond or stream is also not a good idea.
Sandy soil
The sandy loam and other types of soils containing sand are well suited for growing this species of maple. There is no need to improve such soil.
Another thing is if you have pure sand in your yard. In this case, you need to prepare a different substrate for planting.
Use black soil or other garden soil that is available in your area. Add a few bags to where the maple will grow and mix it with the sand. You can also add some organic matter there.
Also, mulch the surface around the maple with pine bark or wood chips. This will reduce the speed at which the ground dries out. A layer of mulch should be at least 2 inches.
Soil pH
Regarding soil pH, the Japanese maple is a tree that likes slightly acidic soil. This means that the optimal range is 5.5-7.0.
Most soils on our planet are neutral, i.e., their pH is between 6.0-7.0. In this case, you don’t have to worry about anything, as your maple will thrive in this soil type.
But if you suspect your soil is unsuitable, you need to measure the soil’s acidity. To do this, buy a soil test kit. Such kits are widely available on the market.
If the soil is too alkaline (pH>7.0), nitrogen problems can occur. This will cause the leaves to turn yellow. To fix this, add a little acidifier such as aluminum sulfate, which is also commercially available.
Soil that is too acidic (pH<5.0) is also a problem because it blocks the plants from getting phosphorus. To remedy this, add peat or some garden sulfur to the soil before planting.
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