The Ulmus 'Frontier' is a hybrid elm cultivar known for its distinctive characteristics that make it a popular choice for urban environments. Here are the main characteristics of the Ulmus 'Frontier':

1. Hybrid Origin: It is a cross between Ulmus carpinifolia and Ulmus parvifolia, combining traits from both parent species.

2. Size and Form: This elm typically grows to a medium size, reaching heights of about 30 to 40 feet with a spread of 20 to 30 feet. It has a pyramidal to oval shape, which makes it suitable for street and landscape planting.

3. Foliage: The leaves are glossy and dark green, turning to a striking red or burgundy in the fall, offering excellent seasonal interest.

4. Disease Resistance: One of the key features of the 'Frontier' elm is its resistance to Dutch elm disease, a major concern for many elm species. It also shows good resistance to elm leaf beetle and other common elm pests.

5. Adaptability: Ulmus 'Frontier' is highly adaptable to various soil types and conditions, including urban pollution, drought, and compacted soils. This makes it an ideal choice for city landscapes and areas with challenging growing conditions.

6. Growth Rate: It has a moderate to fast growth rate, which is beneficial for quickly establishing shade and ornamental value.

These characteristics make Ulmus 'Frontier' a versatile and resilient choice for enhancing urban and suburban landscapes.