Green Giant arborvitae thrives when planted in early spring or early fall, avoiding summer heat stress. Knowing when to plant green giant arborvitae is the single most important factor for ensuring your trees grow fast and stay healthy. This guide walks you through the exact timing, step-by-step planting methods, and common mistakes to avoid.
Why Timing Matters For Green Giant Arborvitae
Planting at the wrong time stresses the tree. If you plant in midsummer, the heat can dry out the roots before they establish. In deep winter, frozen ground prevents root growth entirely.
The goal is to give your arborvitae a few months of mild weather. This allows roots to spread before extreme temperatures arrive. Early spring and early fall are the only windows that consistently work.
Benefits Of Spring Planting
Spring planting gives your tree the entire growing season to settle in. Soil is warming up, and rain is usually plentiful. Roots grow actively in cool, moist soil.
- Roots establish before summer drought
- Less watering needed initially
- Tree can handle first winter better
Benefits Of Fall Planting
Fall planting works because soil is still warm from summer, but air temperatures are cooler. This reduces water loss from leaves. Roots keep growing until the ground freezes.
- Cooler air reduces transplant shock
- Less competition from weeds
- Tree gets a head start in spring
When To Plant Green Giant Arborvitae: The Exact Timing
The best time is when the soil is workable and temperatures are moderate. For most regions, this means:
- Early spring: After the last frost date, when soil temperature is above 50°F (10°C).
- Early fall: At least 6 weeks before the first hard frost, usually September to October.
Avoid planting during heat waves or when the ground is waterlogged. Check your local frost dates online. If you live in a warm climate like zone 8 or 9, you can also plant in late winter.
Regional Variations
Your location changes the ideal planting window. Here is a quick breakdown:
- Northern zones (3-5): Plant in early spring (April to May) or early fall (August to September).
- Central zones (6-7): Spring (March to April) or fall (September to October) both work well.
- Southern zones (8-9): Fall (October to November) is best. Spring is also fine if you avoid summer heat.
How To Plant Green Giant Arborvitae Step By Step
Once you know when to plant green giant arborvitae, follow these steps for success. Preparation is key.
Step 1: Choose The Right Location
Green Giants need full sun to partial shade. They grow best with at least 6 hours of direct sunlight daily. Soil should be well-draining. Avoid low spots where water pools.
Space trees 5 to 6 feet apart for a dense privacy hedge. For a looser screen, space them 8 to 10 feet apart.
Step 2: Prepare The Soil
Dig a hole twice as wide as the root ball but no deeper. The top of the root ball should sit level with the ground. Loosen the soil around the hole to help roots spread.
- Remove grass and weeds from a 3-foot circle
- Mix in compost if soil is heavy clay
- Do not add fertilizer at planting time
Step 3: Plant The Tree
Gently remove the tree from its container. If roots are circling, loosen them with your fingers. Place the tree in the hole and backfill with native soil.
- Water the root ball before placing it in the hole
- Fill the hole halfway, then water again to settle soil
- Finish filling and tamp down gently
Step 4: Water Thoroughly
Water deeply right after planting. Give the tree about 5 to 10 gallons of water. This removes air pockets and ensures root contact with soil.
For the first month, water every 2 to 3 days if there is no rain. After that, water weekly until the ground freezes or summer heat arrives.
Common Mistakes When Planting Green Giant Arborvitae
Even with perfect timing, mistakes can kill your tree. Avoid these common errors.
Planting Too Deep
This is the number one killer. If the root ball is buried, the trunk can rot. Always keep the top of the root ball slightly above ground level.
Overwatering Or Underwatering
New trees need consistent moisture, but not soggy soil. Stick your finger 2 inches into the soil. If it feels dry, water. If it feels wet, wait.
Ignoring Spacing
Planting too close together leads to poor air circulation and disease. Too far apart leaves gaps in your screen. Measure twice before digging.
Planting In Summer
Summer planting is risky. If you must plant in summer, choose a cloudy day and water daily. Even then, survival rates are lower.
Aftercare For Newly Planted Green Giants
Care after planting is just as important as the planting itself. Follow these guidelines for the first year.
Mulching
Apply a 2 to 3 inch layer of mulch around the base. Keep mulch 3 inches away from the trunk. This retains moisture and regulates soil temperature.
- Use wood chips, bark, or straw
- Do not pile mulch against the trunk
- Refresh mulch each spring
Fertilizing
Do not fertilize at planting time. Wait until the next spring. Use a slow-release fertilizer formulated for evergreens. Follow package instructions.
Pruning
Green Giants rarely need pruning. If you want a denser hedge, trim the tips in early spring. Remove any dead or damaged branches as needed.
Signs Your Green Giant Arborvitae Is Stressed
Even with correct timing, trees can show stress. Watch for these signs and act quickly.
- Yellowing needles: Often from overwatering or poor drainage
- Brown tips: Usually from windburn or drought
- Wilting: Indicates root damage or underwatering
- Drooping branches: May be from heavy snow or ice
If you see these issues, check your watering schedule. Adjust based on weather and soil moisture. Most problems are fixable if caught early.
Frequently Asked Questions
Can I Plant Green Giant Arborvitae In Winter?
It is not recommended. Frozen ground prevents root growth. If you must plant in winter, choose a thawed period and protect the tree with mulch.
How Late In Fall Can I Plant Green Giant Arborvitae?
Plant at least 6 weeks before the first hard frost. In most zones, this means no later than mid-October. Check your local frost date.
What Happens If I Plant Green Giant Arborvitae In Summer?
Survival rates drop significantly. The tree may suffer from heat stress and require constant watering. It is best to wait for cooler weather.
Do Green Giants Need Full Sun?
They grow best in full sun but tolerate partial shade. In shade, they grow slower and may become less dense. Aim for at least 6 hours of sun daily.
How Fast Do Green Giant Arborvitae Grow After Planting?
They grow 3 to 5 feet per year once established. The first year is slower as roots settle. By year two, you will see rapid growth.
Final Tips For Success
Knowing when to plant green giant arborvitae is only the first step. Good soil preparation, proper watering, and patience are equally important.
Do not rush the process. Give your trees space to grow. Water consistently during the first year. With the right care, your Green Giants will become a beautiful, low-maintenance screen.
Remember: early spring or early fall are your windows. Stick to those times, and your arborvitae will thrive for decades.
If you have heavy clay soil, consider raising the planting bed slightly. This improves drainage and prevents root rot. Also, protect young trees from deer and rabbits with fencing or repellent.
Green Giant arborvitae are hardy and forgiving. Even if you make a small mistake, they often recover. Just keep the basics in mind: plant at the right time, water deeply, and mulch well.
Your privacy screen will be worth the effort. These trees grow fast and stay green all year. They provide wind protection, noise reduction, and beauty to your landscape.
Start by checking your local frost dates. Then choose your planting window. With this guide, you have everything you need to succeed.
Happy planting, and enjoy your new Green Giants.