Pollination info for Green Giant Arborvitae (Thuja standishii x plicata 'Green Giant')

Green Giant Arborvitae is a hybrid cultivar resulting from a cross between two species of Thuja: Thuja standishii and Thuja plicata. As a hybrid, Green Giant Arborvitae is typically sterile and does not produce viable seed.

However, Green Giant Arborvitae can still be pollinated by wind or insects, which may transfer pollen from other nearby trees or shrubs. This may result in the production of seedless fruits or small, non-viable seeds.

It is worth noting that due to its sterile nature, Green Giant Arborvitae does not pose a risk of aggressive spread or invasiveness, making it a popular choice for landscape planting.

Green Giant Arborvitae (Thuja standishii x plicata 'Green Giant') FAQ

1. What is Green Giant Arborvitae?

Green Giant Arborvitae, scientifically known as Thuja standishii x plicata 'Green Giant', is a popular evergreen tree that is widely cultivated for its ornamental value. It is a hybrid of two other arborvitae species, namely, Japanese arborvitae and Western red cedar.

2. How tall does Green Giant Arborvitae grow?

Green Giant Arborvitae can grow up to 60-80 feet in height and 15-25 feet in width, making it one of the tallest and largest arborvitae species. It is a fast-growing tree, and on average, it grows 3-5 feet per year.

3. What is the ideal planting location for Green Giant Arborvitae?

Green Giant Arborvitae prefers well-drained, moist soil and full sun exposure. It can tolerate partial shade, but it grows best in full sun. The tree is hardy in zones 5-7, but it can also thrive in zones 8-9 with adequate irrigation.

4. How do I plant Green Giant Arborvitae?

Planting Green Giant Arborvitae is relatively easy. You should dig a hole that is twice as wide as the tree's root ball and slightly shallower than the depth of the root ball. Place the tree in the hole, backfill with soil, and water thoroughly. It is important to keep the soil moist for the first few months after planting.

5. How do I care for Green Giant Arborvitae?

Green Giant Arborvitae requires minimal maintenance. You should water the tree regularly, especially during prolonged dry spells, and fertilize it once a year in the spring or fall with a slow-release fertilizer. You should also prune the tree to remove any dead or diseased branches and shape it as needed.

6. What are some common pests and diseases that affect Green Giant Arborvitae?

Green Giant Arborvitae is relatively resistant to pests and diseases, but it is susceptible to spider mites, bagworms, and scale insects. It can also be affected by several fungal diseases, such as cedar apple rust, root rot, and canker. You should monitor the tree regularly for any signs of pest or disease infestation and take appropriate measures to control the problem.

7. When is the best time to prune Green Giant Arborvitae?

The best time to prune Green Giant Arborvitae is in the late winter or early spring before new growth begins. You should avoid pruning the tree in late summer or early fall, as this can stimulate new growth that might not have time to harden off before winter.

8. Can Green Giant Arborvitae be used as a hedge?

Yes, Green Giant Arborvitae is an excellent choice for a privacy hedge, as it grows tall, thick, and fast. You can plant the trees 5-6 feet apart to create a dense hedge, and prune them annually to keep them in the desired shape and size.

9. Can Green Giant Arborvitae be grown in containers?

No, Green Giant Arborvitae is not an ideal tree for container gardening, as it grows too large and needs a lot of space for its root system to develop. It is better suited for open landscapes, parks, and large gardens.

10. Is Green Giant Arborvitae toxic to pets?

No, Green Giant Arborvitae is not toxic to pets, but you should still keep an eye on your pets when they are around the tree, as the needles can be sharp and prickly, and the tree can drop large cones that could cause injury if they fall on your pet.

Planting & Care for Green Giant Arborvitae

Planting

1. Choose a planting location that receives full sun to partial shade.
2. Ensure the soil is well-draining and has good fertility.
3. Dig a hole that is 2-3 times wider than the root ball and no deeper than the root ball.
4. Remove the tree from the container and gently loosen any roots that are tightly wound around the root ball.
5. Place the tree in the center of the hole and backfill with soil, tamping lightly to remove any air pockets.
6. Water the tree deeply immediately after planting.

Care

1. Water: Green Giants require deep, regular watering during the first growing season. After that, they can tolerate moderate drought.
2. Fertilizer: Feed with a slow-release granular fertilizer in the spring and fall.
3. Pruning: Prune as needed to maintain desired shape and size. Avoid pruning back into old growth as this can lead to sparse, unattractive foliage.
4. Pests and Diseases: Green Giants are relatively disease- and pest-resistant, but can occasionally be affected by bagworms, spider mites, or aphids. Regular inspections can help identify and address any issues before they become problematic.

By following these simple planting and care guidelines, you can enjoy a healthy, beautiful Green Giant Arborvitae for years to come.