Thuja Green Giant Care Guide: How to Grow Green Giant Arborvitae

Introduction

Thuja Green Giant, also called Green Giant Arborvitae, is one of the most popular evergreen trees for privacy screens, property lines, windbreaks, and year-round landscape structure. It grows quickly, stays green through the seasons, and can create a living wall of privacy when planted and cared for correctly.

This care guide covers how to grow Thuja Green Giant successfully, including sunlight, watering, soil, planting, pruning, spacing, fertilizing, winter care, common problems, and privacy screen tips.

What Is Thuja Green Giant?

Thuja Green Giant is a fast-growing evergreen tree known for its dense green foliage, pyramidal shape, and strong use as a privacy screen. It is often planted in rows along property lines, fences, driveways, and open yard edges where homeowners want tall evergreen coverage.

Compared with smaller arborvitae varieties, Thuja Green Giant is usually chosen when you want more height, faster growth, and larger-scale privacy. It is a strong option for homeowners who have enough room and want a low-maintenance evergreen once the trees are established.

For a fast-growing evergreen privacy tree, shop the Thuja Green Giant from Simply Trees.

Thuja Green Giant Care at a Glance

Why Choose Thuja Green Giant?

Thuja Green Giant is popular because it solves one of the most common landscape problems: creating privacy quickly without building a fence. Its dense evergreen foliage helps block views, soften property lines, and add structure to the yard throughout the year.

It is especially useful for larger spaces where smaller evergreens may not create enough coverage. When planted in the right location and watered well during establishment, Thuja Green Giant can become a dependable, low-maintenance privacy tree.

Thuja Green Giant is a good choice if you want:

• A fast-growing evergreen privacy tree
• Year-round green foliage
• A tall living screen
• A windbreak or property line planting
• A low-maintenance evergreen once established
• A natural backdrop for shrubs, flowers, and outdoor living areas

How Much Sun Does Thuja Green Giant Need?

Thuja Green Giant grows best in full sun to partial sun. For the densest growth and strongest privacy coverage, choose a location that receives plenty of direct sunlight each day.

It can tolerate some partial sun, but too much shade may lead to thinner growth and a less full screen. If privacy is your goal, sunlight matters because fuller foliage helps close gaps between trees over time.

Best light conditions:

• Full sun for the fastest and fullest growth
• Partial sun in suitable landscape locations
• Open areas with good airflow
• Avoid deep shade when planting for a dense privacy screen

Best Soil for Thuja Green Giant

Thuja Green Giant grows best in well-draining soil. It can adapt to different soil types, but it does not like sitting in constantly wet or poorly drained ground.

The most important soil factor is drainage. If water collects around the roots after rain, the tree may become stressed. Poor drainage can lead to browning, thinning, slow establishment, or root problems.

Good soil conditions include:

• Well-draining native soil
• Loamy soil with moderate moisture
• Planting areas that do not stay soggy
• Soil that is not heavily compacted
• Mulched beds that help regulate soil moisture

If your soil is heavy clay, avoid planting the tree too deeply. Planting slightly high can help keep the root flare from sitting below grade.

How to Plant Thuja Green Giant

Proper planting is one of the most important steps for long-term Thuja Green Giant success. A tree planted too deeply, placed in poor drainage, or watered inconsistently after planting may struggle even if the variety itself is hardy and vigorous.

Planting steps:

1. Choose a location with full sun to partial sun.
2. Make sure the site has enough room for the tree’s mature size.
3. Dig a hole about twice as wide as the root ball.
4. Keep the hole about the same depth as the root ball.
5. Place the tree so the root flare is at or slightly above soil level.
6. Backfill with native soil and gently firm around the roots.
7. Water deeply after planting.
8. Add mulch around the base, keeping it away from the trunk.

For a more detailed planting walkthrough, read the Simply Trees Guide to Planting.

How to Water Thuja Green Giant

Watering is most important during the first year after planting. Newly planted Thuja Green Giant trees need consistent moisture while their roots establish, but they should not sit in soggy soil.

After planting

Water deeply right after planting to settle the soil around the root ball. During the first few weeks, check the soil regularly and water when the top few inches begin to dry.

During the first growing season

During the first growing season, water deeply and consistently. The exact schedule depends on rainfall, heat, soil type, sun exposure, and drainage. Hot, dry, or windy weather may require more frequent watering.

Once established

Once established, Thuja Green Giant becomes more drought tolerant and lower maintenance. Mature trees usually need supplemental water during extended dry spells, extreme heat, or drought conditions.

Watering tips:

• Water deeply instead of lightly sprinkling.
• Check soil moisture before watering again.
• Keep the root ball evenly moist during establishment.
• Avoid constantly soggy soil.
• Water at the base of the tree when possible.
• Pay extra attention during the first summer after planting.

For broader watering guidance, read the Simply Trees Guide to Watering.

How Far Apart Should You Plant Thuja Green Giant?

Spacing depends on your landscape goal. If you want a tight privacy screen, plant Thuja Green Giant closer together so the trees fill in over time. If you want a more open evergreen row, give each tree more room to show its natural shape.

For exact spacing by privacy goal, see the Thuja Green Giant Privacy Screen Spacing & Planting Guide.

Using Thuja Green Giant for Privacy

Thuja Green Giant is one of the strongest choices for a living privacy screen because it combines height, evergreen foliage, and fast growth. It works well along fences, property lines, patios, pools, driveways, and large open yard edges.

For the best privacy screen, think about sunlight, spacing, and long-term room before planting. Trees that are planted too close to structures or other large plants may become crowded as they mature.

Best privacy uses:

• Backyard privacy screens
• Property line plantings
• Fence line coverage
• Poolside screening
• Driveway borders
• Windbreaks
• Evergreen backdrops for mixed landscapes

For more options beyond Thuja, read Best Privacy Trees for Your Yard.

How Fast Does Thuja Green Giant Grow?

Thuja Green Giant is known as a fast-growing evergreen, especially when planted in full sun with consistent moisture during establishment. Growth rate depends on sunlight, soil quality, water, climate, and how well the tree settles into its planting site.

New trees may spend some energy establishing roots before they show strong top growth. Once established, healthy Thuja Green Giant trees can grow quickly and fill into a larger privacy screen over time.

For a deeper breakdown of growth expectations, read the Thuja Green Giant Growth Rate Guide.

How Big Does Thuja Green Giant Get?

Thuja Green Giant is a large evergreen tree, so it needs more room than compact arborvitae varieties. Its mature size is part of what makes it useful for privacy, but it also means you should plan carefully before planting.

Do not place Thuja Green Giant too close to buildings, fences, walkways, driveways, or overhead lines. Give the tree enough space to develop naturally and avoid future crowding.

How to Prune Thuja Green Giant

Thuja Green Giant naturally grows in a pyramidal shape, so heavy pruning is usually not necessary. Most homeowners only need to prune lightly to shape the tree, remove damaged branches, or maintain a clean hedge line.

Avoid cutting deeply into bare interior wood. Like many evergreens, arborvitae may not regrow well from older wood that no longer has green foliage.

Pruning tips:

• Prune lightly to shape the tree.
• Remove dead, damaged, or diseased branches when noticed.
• Avoid cutting into bare old wood.
• Do not remove the central leader unless necessary.
• Use clean, sharp pruning tools.
• Avoid heavy pruning during extreme heat or drought stress.

When Should You Prune Thuja Green Giant?

Light pruning is usually best in late winter to early spring before strong new growth begins. Minor touch-up pruning can also be done during the growing season if needed.

Avoid heavy pruning late in the season. Late pruning can encourage tender new growth that may be more vulnerable to winter stress.

Fertilizing Thuja Green Giant

Thuja Green Giant usually does not need heavy fertilizing when planted in healthy soil. If growth is weak or the soil is poor, a slow-release evergreen or balanced fertilizer can be applied in spring according to the label directions.

Avoid overfertilizing. Too much fertilizer can push soft growth and may stress the tree if watering, drainage, or sunlight are not right. Healthy root establishment and consistent moisture are more important than frequent feeding.

Fertilizing tips:

• Fertilize in spring if needed.
• Use a slow-release evergreen or balanced fertilizer.
• Follow label directions carefully.
• Do not fertilize a severely stressed or drought-damaged tree.
• Avoid heavy late-season fertilizing.

For general feeding guidance, read the Simply Trees Guide to Fertilizing.

Mulching Around Thuja Green Giant

Mulch helps Thuja Green Giant by conserving soil moisture, reducing weeds, and protecting roots from temperature swings. This is especially useful during the first year after planting.

Apply a 2 to 3 inch layer of mulch around the base of the tree. Keep mulch several inches away from the trunk. Do not pile mulch against the trunk, because trapped moisture can contribute to bark and root problems.

Thuja Green Giant Winter Care

Thuja Green Giant is evergreen, so it continues to lose moisture through its foliage during winter. Cold wind, dry soil, frozen ground, and winter sun can all contribute to stress, especially for newly planted trees.

The best winter care starts in fall. Keep the trees properly watered before the ground freezes, especially if rainfall has been low. A well-hydrated tree is better prepared for winter than a tree entering cold weather dry and stressed.

Winter care tips:

• Water well in fall before the ground freezes.
• Maintain a mulch layer around the root zone.
• Avoid heavy pruning late in the season.
• Protect newly planted trees from harsh wind if needed.
• Brush off heavy snow gently instead of pulling branches.
• Avoid using harsh de-icing salts near the root zone.

Why Is My Thuja Green Giant Turning Brown?

Browning is one of the most common Thuja Green Giant concerns. The cause can vary depending on where the browning appears and what conditions the tree has recently experienced.

For a deeper troubleshooting guide, read Thuja Green Giant Turning Brown: Causes, Fixes & Prevention.

Common Thuja Green Giant Problems

Thuja Green Giant is generally low maintenance, but problems can appear when trees are stressed by poor planting, inconsistent watering, heavy shade, compacted soil, winter exposure, or poor drainage.

1. Browning foliage

Browning may come from underwatering, overwatering, transplant shock, winter burn, pests, or natural interior shedding. Check soil moisture and the browning pattern first.

2. Yellowing foliage

Yellowing can happen when the roots are stressed, the soil stays too wet, or the tree is adjusting after planting. Poor drainage is a common issue to investigate.

3. Thin or open growth

Thin growth is often caused by too much shade, crowding, or inconsistent water during establishment. Thuja Green Giant grows fullest with strong sun and proper spacing.

4. Root stress

Root stress can happen when trees are planted too deeply, watered too much, allowed to dry out, or placed in compacted soil. Keep the root flare visible and make sure water drains properly.

5. Branch bending from snow

Heavy snow can bend branches. Gently brush off snow when possible, but avoid pulling or forcing frozen branches back into place.

6. Pest pressure

Healthy Thuja Green Giant trees are usually resilient, but stressed trees can become more vulnerable to pests. Inspect foliage and branches if you notice thinning, webbing, discoloration, or unusual dieback.

How to Tell If Your Thuja Green Giant Is Healthy

A healthy Thuja Green Giant usually has consistent green foliage, flexible outer branch tips, steady new growth during the growing season, and soil that stays moderately moist without remaining soggy.

Signs of a healthy tree include:

• Green, dense outer foliage
• Steady growth during the growing season
• No spreading dieback
• Firm, upright structure
• Soil that drains well after watering or rain
• No major pest damage or webbing

Thuja Green Giant vs. Emerald Green Arborvitae

Thuja Green Giant and Emerald Green Arborvitae are both popular evergreen privacy trees, but they fit different spaces. Thuja Green Giant is larger and faster growing, while Emerald Green Arborvitae is narrower, more compact, and better for smaller yards or tighter planting areas.

Choose Thuja Green Giant when you have room for a larger privacy screen and want faster coverage. Choose Emerald Green Arborvitae when you need a more compact evergreen for a narrower space.

For a full comparison, read Emerald Green Arborvitae vs. Thuja Green Giant.

Is Thuja Green Giant Low Maintenance?

Yes, Thuja Green Giant is low maintenance once established. It naturally grows in a strong evergreen shape, needs little pruning, and can handle many landscape conditions when planted in the right location.

The most important maintenance happens early. During the first year, focus on consistent watering, proper mulch, and making sure the tree is not planted too deeply. Once the roots are established, care becomes much easier.

Best Places to Use Thuja Green Giant in the Landscape

Thuja Green Giant works best where you need tall evergreen coverage and have enough room for the tree to mature. It is especially useful in open yards, along property lines, and around outdoor living spaces where privacy is important.

Good planting locations include:

• Backyard property lines
• Fence lines
• Large side yards
• Windbreak rows
• Driveway borders
• Poolside privacy screens
• Evergreen backdrops behind mixed shrubs

Avoid planting Thuja Green Giant in very tight spaces where the mature tree will crowd walkways, buildings, fences, or other major plantings.

Thuja Green Giant Care Mistakes to Avoid

Planting Too Close Together

Close spacing can help create a privacy screen, but trees still need room for airflow, root growth, and mature size. Crowding can create long-term maintenance problems.

Planting Too Deeply

Planting too deeply can stress the trunk and roots. Keep the root flare at or slightly above soil level.

Watering Too Lightly

Light sprinkling does not reach the full root ball. Water deeply so moisture reaches the roots and surrounding soil.

Letting New Trees Dry Out

Newly planted Thuja Green Giant trees need consistent moisture while establishing. Dry soil during the first growing season can lead to browning and stress.

Planting in Poor Drainage

Thuja Green Giant does not like constantly wet soil. Avoid low areas where water collects after rain.

Pruning Too Aggressively

Heavy cuts into bare old wood can leave gaps that may not fill back in. Prune lightly and regularly when shaping is needed.

FAQ: Thuja Green Giant Care

Is Thuja Green Giant the same as Green Giant Arborvitae?

Yes. Thuja Green Giant is often called Green Giant Arborvitae. Both names refer to the same popular fast-growing evergreen privacy tree.

How much sun does Thuja Green Giant need?

Thuja Green Giant grows best in full sun to partial sun. Full sun usually supports faster growth and denser foliage.

How often should I water Thuja Green Giant?

Water deeply after planting and keep the soil evenly moist during the first growing season. Once established, water during drought, extreme heat, or long dry spells.

Is Thuja Green Giant good for privacy?

Yes. Thuja Green Giant is one of the best evergreen trees for privacy screens because it grows quickly, stays green year-round, and forms dense coverage when spaced properly.

How far apart should I plant Thuja Green Giant?

Spacing depends on whether you want a tight privacy screen, a looser windbreak, or individual specimen trees. Closer spacing creates faster coverage, while wider spacing gives each tree more room to mature.

Does Thuja Green Giant need pruning?

Only light pruning is usually needed. Remove dead or damaged growth and lightly shape the tree if necessary. Avoid cutting deeply into bare old wood.

Why is my Thuja Green Giant turning brown?

Browning can come from drought, overwatering, poor drainage, transplant shock, winter burn, pests, or natural interior shedding. Check the browning pattern and soil moisture first.

Can Thuja Green Giant grow in shade?

Thuja Green Giant can tolerate some partial sun, but too much shade may lead to thinner growth. Full sun is best for a dense privacy screen.

Is Thuja Green Giant low maintenance?

Yes. Thuja Green Giant is low maintenance once established. It usually needs consistent early watering, proper spacing, mulch, and occasional light pruning.

Can Thuja Green Giant be planted near a fence?

Yes, but leave enough room for mature growth, airflow, and maintenance access. Avoid planting directly against the fence.

Final Thoughts

Thuja Green Giant is a strong choice for homeowners who want fast-growing evergreen privacy, year-round structure, and a natural living screen. It is especially useful for property lines, windbreaks, large borders, and outdoor spaces where privacy matters.

For best results, plant Thuja Green Giant in full sun to partial sun, choose well-draining soil, water consistently during the first year, mulch properly, and prune lightly. Once established, it becomes a durable, low-maintenance evergreen that can bring privacy and structure to the landscape for years.