New Horizon Elm (Ulmus 'New Horizon') is an ornamental tree that is commonly used in landscaping and as a shade tree. For proper growth and reproduction, it requires pollination by insects or wind.

The tree is considered self-fertile, meaning it is able to produce fruit and seeds with its own pollen. However, cross-pollination from other New Horizon Elms or compatible elm species such as American Elm (Ulmus americana) can increase fruit production and increase genetic diversity, resulting in stronger, healthier trees.

Pollination occurs when pollen from the male flowers travels to the female flowers through wind or insect activity. The tree produces small, green flowers in early spring before the leaves appear. Male and female flowers are produced separately on the same tree and are wind-pollinated.

As an insect-pollinated tree, New Horizon Elm attracts a variety of pollinators such as bees, butterflies, and moths. These insects are attracted to the tree's flowers for nectar and are essential for the pollination process.

In summary, while New Horizon Elm is self-fertile, cross-pollination from other New Horizon Elms or compatible elm species can improve fruit production and increase genetic diversity. The tree produces small, green wind-pollinated flowers in early spring and attracts a variety of pollinators for insect-pollination.

New Horizon Elm (Ulmus 'New Horizon') FAQ

1. What is a New Horizon Elm?

New Horizon Elm (Ulmus 'New Horizon') is a type of deciduous tree that typically grows to a height of 50 - 60 feet and a spread of 30 - 40 feet. It is known for its dense and symmetrical crown and its resistance to Dutch elm disease.

2. How do I plant a New Horizon Elm?

New Horizon Elms prefer well-drained soil and full sun exposure. When planting, dig a hole twice as wide as the root ball, but no deeper than the soil level in the container. Place the tree in the hole, straighten it, and backfill with soil, making sure to tamp it down to remove air pockets. Water thoroughly.

3. How often should I water my New Horizon Elm?

New Horizon Elms require regular watering, especially during the first year after planting. Water deeply once a week during dry periods, and adjust watering frequency as necessary based on weather conditions.

4. How much fertilizer does a New Horizon Elm need?

A New Horizon Elm should be fertilized once a year in the late fall or early spring using a slow-release, balanced fertilizer. The amount of fertilizer needed will vary depending on the size of the tree.

5. When is the best time to prune a New Horizon Elm?

The best time to prune a New Horizon Elm is during the late winter or early spring while the tree is still dormant. This is when it is easiest to see the branches and make proper cuts.

6. How do I prevent Dutch elm disease in my New Horizon Elm?

New Horizon Elms are resistant to Dutch elm disease, but it is still important to take preventative measures. These include proper pruning techniques, using disease-resistant cultivars, and avoiding root grafting with infected trees.

7. How long does it take for a New Horizon Elm to mature?

It typically takes a New Horizon Elm around 20 - 25 years to reach maturity and its full height of 50 - 60 feet.

8. What other pests or diseases should I look out for in my New Horizon Elm?

In addition to Dutch elm disease, New Horizon Elms may be susceptible to other diseases such as anthracnose, leaf spot, and canker. They may also be susceptible to pests such as elm leaf beetle and aphids. Regular maintenance and proper care can help prevent these issues.

Planting & Care for New Horizon Elm (Ulmus 'New Horizon')

Planting

• Choose a site with well-drained soil and full sun to partial shade.
• Plant in the spring or fall.
• Dig a hole that is twice as wide and deep as the tree's root ball.
• Remove the tree from its container and loosen any tangled roots.
• Place the tree in the hole so that the top of the root ball is level with the ground.
• Backfill the hole with soil, tamping it down firmly as you go.
• Water the tree thoroughly.
• Spread a layer of organic mulch around the tree, but not touching the trunk.

Care

• Water the tree deeply once a week during the growing season.
• Fertilize the tree with a balanced fertilizer in the spring.
• Prune the tree in late winter or early spring to remove any dead or damaged branches.
• Protect the tree from pests and diseases by keeping it healthy and monitoring it regularly for any signs of trouble.