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Ulmus americana 'New Harmony'

Status: In stock

Product ID#: enhar
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Product Description
Sun Exposure Sun
Bloom Time Spring
Soil Conditions Normal, Clay/Heavy
Fall Color Yellow
Fruit Color Brown, Green
Mature Plant Size (H x W) 50-70' x 50-70'
New Harmony is a highly Dutch Elm disease-resistant American Elm that has been tested by the U.S. National Arboretum. This variety is a very urban savvy tree that exhibits the old American Elm form. Upright, vase-shaped tree with an arching form. Dark green leaves turn yellow in fall.
  • sunshade Sun
  • Mature Plant Size (H x W) Mature Plant Size (H x W): 50-70' x 50-70'
  • Bloom Season Bloom Season: Spring
Key features
  • Drought Tolerant
  • Salt Tolerant
  • Walnut Toxicity Resistant
  • Attracts Pollinators
Planting Care

Planting & Care for Trees – New Harmony American Elms

Preparation
  • Elms prefer full sun or partial shade and moist, well-drained fertile soil. They adapt to wet or dry soil as well.
  • They make good street trees because they tolerate urban conditions, but keep in mind than planting an elm tree near sidewalks can lead to cracks and raised areas.
  • You can plant container-grown trees any time of year. Bare root, balled and burlapped (B&B) elms are best planted in spring or late fall.
  • Don’t amend the soil in the hole at planting time unless it is very poor. Add a little compost to the fill dirt for poor soils.
  • Wait until next spring to fertilize an elm tree.
  • Mulch the tree immediately after planting. Mulch helps the soil hold moisture and reduces competition from weeds.
Opening Plant Material
  • Bare Root - Cut open the bundle (top and roots are tied) and separate all the plants. Soak roots in buckets of water until planted. Each plant type will be labeled separately for identification. Do not expose the roots to sun. They should never dry out. Keep roots covered. All bare-root plants must be trimmed when planted. 
  • B&B - Soak root ball very well.
  • Scroll down and click on the orange rectangular box "Handling & Planting Guidelines" to see illustrations on how to plant properly. 
Planting Bare Root
  • Plant Bare root in fall. A good indicator if you can still plant is if the ground is still workable you’re good to go. If a hard frost is expected be sure to hold off on planting.
  • Dig a hole at least 6" wider and the same depth as the root mass. The crown or graft of the plant should be slightly higher than ground level where it was grown at the nursery.
  • Trim off the broken roots and branches.
  • Place fertilizer packets in hole (if purchased). Do not place other fertilizers in the planting hole. *Use Our Recommended Fertilizer.
  • Spread the roots and fill halfway with soil, then water until soil settles completely saturating the soil and planting pit.
  • Re-adjust plant and fill the hole with the rest of the soil.
  • Back fill the balance of the soil and water well. 
  • See our link below “Handling & Planting Guidelines” for illustrations on planting.   
Planting B&B trees
  • Plant B&B trees in spring or fall. A good indicator if you can still plant is if the ground is still workable you’re good to go. If a hard frost is expected be sure to hold off on planting.
  • Dig a hole at least 6" wider and no deeper than the size of the ball on the plant. Rotate the plant to the proper position. Never lift or move trees by the tops.
  • Notice where the base of the trunk flairs out from the tree. This is called the root flair. This root flair should show when the tree is planted. If necessary, add soil under the ball so the root flair is exposed.
  • Place fertilizer packets into the bottom of the hole (if purchased). *Use Our Recommended Fertilizer
  • Backfill ½ of the hole with soil and completely saturate the soil with water.
  • Once the tree is straight and located as desired, cut and remove twine. Then, remove or bend back top ? of metal basket. Lastly, remove exposed burlap from top of ball
  • Fill the hole to the top of the ball with soil, then soak well with water and let settle.
  • The top of the root ball should be visible and slightly higher than the soil around it.
  • Add mulch on top of soil making sure to not put mulch against the trunk or stems.
  • See our link below “Handling & Planting Guidelines” for illustrations on planting.
Pruning - After Planting
  • Bare Root - Prune ALL bare root plants to reduce transplant shock and ensure success. Pruning should occur either before or as soon after planting as possible. All pruning should be done with a sharp pruning shears.
  • B&B - Although it is not essential for B&B or containers to be pruned after planting, a light pruning for shape, to remove any broken branches from shipping, or to thin out a heavily branched plant will help in the transplanting process and in the appearance of your new planting.
Pruning - Through-out the Season
  • It’s best to hire a professional to prune the dead or broken branches from your elm trees to get rid of elm bark beetle breeding sites. Do not prune during the pruning ban (April 1st – August 31st) when the smell from cut branches can attract elm bark beetles. McKay Nursery does perform maintenance on our landscape properties.
Watering - After Planting
  • Plants typically take approximately 6 weeks to establish new roots in your soil. During this period, water plants as often as every 2-4 days at the start and at least a minimum of once per week.
  • Beyond the 6 week establishment period, water once per week, unless rains occur.
  • Stick your finger into the soil around 3” to check soil moisture.
Watering - Through-out the Season
  • After the first season, plants should only be watered during extended periods without rain.
  • How do you know if your plants need water? The easiest way to tell is to touch the soil around the roots. If it is moist, there is no need to water. If it is dry, give it a good soaking with the hose end (no nozzle) watering the soil only, not the leaves.
  • Stick your finger into the soil around 3” to check soil moisture.

Planting & Handling Help

Download our Planting and Handling Guide below to plan for a successful arrival and install of your plants. Be sure to water all plants as soon as they arrive and every day until you’re ready to plant. Keep any bare root bundles in a shady, cool spot with the roots covered at all times.

Learn More

Watch our videos on handling bare root plants, how your order is prepared for shipment and more.

Plant Sizing

What is the difference between Containers, Grow Bags, Bare Root, and Balled & Burlap (B&B)?

Shipping Times

Our FedEx and local shipping times depend on two factors, one is by the region and the second is the type of product being shipped. For example, small fruits are only shipped in spring, but majority of our perennials are shipped from spring until fall. Keep in mind the dates below act as a general guide. Due to unpredictable weather, staffing, inventory and industry demands these timelines can change. Therefore, we cannot guarantee any of these times.

 

Shipping Dates by Region*

 

Northern Cold Region: April 22nd - November 7th

Northern Region: April 15th - November 7th

Middle Region: April 1st - November 7th

Southern Region: March 15th - November 7th

Local Delivery (small radius from Waterloo, WI): April 22nd - November 7th

 

Shipping Dates by Season*

 

Spring Shipping: Region Start Date (above) - May

Fall Shipping: September - November

 

Due to unpredictable weather, these times may vary. Some varieties are exceptions due to heat and plant health reasons. Enter your shipping zip code at the top of this page and be sure to check the shipping information on each product before you add it to your cart. If the product is too large or restricted in your state, you will not be able to checkout with that item in your cart.