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Showing content from https://docs.unity3d.com/6000.0/Documentation/Manual/terrain-Trees.html below:

Manual: Add trees to the terrain

Animate trees with Wind Zones

Add trees to the terrain

Use the Paint Trees tool to place trees on the terrainThe landscape in your scene. A Terrain GameObject adds a large flat plane to your scene and you can use the Terrainâs Inspector window to create a detailed landscape. More info See in Glossary and customize their painting. You can paint trees with a brush or mass place trees across the entire terrain tile.

As an example, use the free Unity Terrain - HDRP Demo Scene, which has six SpeedTree models. You can also create trees with the Tree Editor (for the Built-In Render Pipeline).

The Paint Trees tool

To access tree painting:

In the Hierarchy window, select the terrain.
In the terrainâs InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info See in Glossary window, from the Terrain toolbarA row of buttons and basic controls at the top of the Unity Editor that allows you to interact with the Editor in various ways (e.g. scaling, translation). More info See in Glossary, select Paint Trees.

Select trees

To add trees to the terrain, add a tree prototype to the Paint Tree tool:

Select Edit Trees > Add Tree.
Select a tree.

The Add Tree window has different options based on the tree youâre adding:

Bend Factor: Adjust the treeâs responsiveness to the wind in the sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info See in Glossary. Trees from the SpeedTree Modeler donât have a Bend Factor; only Tree Editor trees do. Refer to Animate trees with Wind Zones for more information.
NavMeshA mesh that Unity generates to approximate the walkable areas and obstacles in your environment for path finding and AI-controlled navigation. More info See in Glossary LODThe Level Of Detail (LOD) technique is an optimization that reduces the number of triangles that Unity has to render for a GameObject when its distance from the Camera increases. More info See in Glossary Index: SpeedTree uses level of detail (LOD) groups. The Unity Editor manages the transitions between groups, but if youâre placing trees that are never going to be near the cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info See in Glossary, or if you need to limit the display quality of trees without editing the model, you can select a specific LOD groupA component to manage level of detail (LOD) for GameObjects. More info See in Glossary. The options are:
- First: The highest LOD, for trees that are close to the player.
- Last: The lowest LOD, for trees that are far away from the player.
- Custom: To select a different level.
Refer to Tree level of detail (LOD) for more information.
Cast Shadows: For Tree Editor trees. This is not editable; it lists the option selected in the treeâs Mesh Renderer > Lighting > Cast Shadows setting.

Customize trees for painting

Customize tree placement and characteristics. Except for Brush Size and Tree Density, the settings apply to both mass placed trees and brush painted trees.

Property Function Brush Size The size of the area each brush stroke covers with trees. Tree Density How far apart trees must be. This limits the number of trees a single brush stroke adds. Note that the limit is by brush stroke, not area, so repeated brush strokes in the same area create higher densities. Note also that the larger the brush, the farther apart the trees, even if the density is 100. Tree Height A range for tree height randomization. Use a wide range for a varied look, and a narrow range for a uniform look. To specify a value instead of a range, disable Random. The possible values are a scale of 0.01 to 2 of the treeâs original height. Lock Width to Height By default, a treeâs width is locked to its height so that trees are always scaled uniformly. To specify a width, disable Lock Width to Height. Tree Width A range for tree width randomization. Use a wide range for a varied look, and a narrow range for a uniform look. To specify a value instead of a range, disable Random. The possible values are a scale of 0.01 to 2 of the treeâs original width. Random Tree Rotation If your tree has a level of detail (LOD) Group (for example, a tree imported from SpeedTree), use the Random Tree Rotation setting to help create the impression of a random, natural-looking forest. Disable this option if you want to place trees with a fixed rotation. Color Variation The amount of random shading applied to trees. This works only if the shaderA program that runs on the GPU. More info See in Glossary reads the _TreeInstanceColor property. All trees created with Tree Editor read the _TreeInstanceColor property, because they all use built-in shaders. Some SpeedTree trees might not read it. Tree Contribute Global Illumination Non-editable; indicates whether the tree assetâs Lighting > Contribute Global Illumination option is enabled. Mass place trees

You can place trees across the entire terrain tile in a single action. Refer to Customize trees for painting (above) for information about customizing trees before painting.

To place trees on an entire terrain tile:

Select tree assets as explained above. Note that mass placing uses all the trees in the Trees list, not just the highlighted tree.
Select Mass Place Trees. The Place Trees window opens.
Enter the number of trees you want to place.
To keep the trees you already have, check the Keep Existing Trees box. If you donât check this box, Unity removes all existing trees and replaces them with the new trees.

You can use the brush tools to add or remove trees that you mass placed.

Paint trees with a brush

You can paint trees onto the terrain with a brush.

To paint trees:

Select trees as explained above.
Refer to Customize trees for painting (above) for information about the brush settings and customizing trees for painting.
Paint trees on the terrain using the brush.
To remove:
- All trees from an area: hold Shift as you paint.
- Only the tree selected in the Trees list: hold Ctrl as you paint.

Edit trees

You can edit the treeâs properties before you place it, or between painting strokes. For example, for SpeedTree trees, you can change the LOD group you use when painting different parts of the terrain.

To edit a tree:

In the Trees list, select the tree you want to edit.
Select Edit Trees > Edit Tree. The Edit Tree window opens. It has the same options as the Add Tree window.

Update imported trees

If you change an imported tree in a separate 3D modeling application, you need to refresh the tree in the Paint Tool to update its appearance on the terrain.

To update the trees, in the Terrain tileâs Inspector window, go to Paint Trees > Trees > Refresh.

Note: Trees from SpeedTree use their own shader to animate wind movement. The Unity Editor adds this shader only to trees that SpeedTree exports with the file type spm or st8. If you edit the trees using a different 3D modeling software and export them as fbx or obj files, the Unity Editor assigns them built-in shaders, and the wind effect is lost. To preserve the wind animation, always use SpeedTree to edit and re-export SpeedTree trees.

Additional resources

Animate trees with Wind Zones

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