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Catalpa

The firethorn plant produces gorgeous cluster of yellow or orange berries in the fall.

By Ellen Barcel

Last week we took a look at a number of trees that you may consider adding to your garden, and how important it is to do research, to make sure that the trees’ qualities match your preferences and requirements. This week, let’s take a look at some perennials and shrubs.

Perennials and shrubs

Deer love hostas (as well as many other plants). Hostas in general don’t do well in sunlight. You may be willing to spend a lot of time watering them and putting up with the crispy edges most develop in strong sunlight. Personally, I just put hostas in the shade in the back yard, away from deer.

One of the biggest mistakes I frequently see is planting rhododendrons in front of windows. That two-foot-tall baby plant, may grow up to 10 or 12 feet tall totally covering the windows. Always check out the variety and its mature size when selecting it, unless, that is, you have a nasty view from a window and wish to block it out.

Wisteria is an aggressive vine that needs a fair amount of pruning to keep it in check
Wisteria is an aggressive vine that needs a fair amount of pruning to keep it in check

Oriental varieties of wisteria are very aggressive. Unless you are willing to tame this beautiful but aggressive plant, avoid it. It climbs up nearby trees, spreads along the ground and roots easily. If, however, you wish to cover a gazebo and are willing to take the time to keep it pruned back, it makes a beautiful privacy screen.

Most, but not all, varieties of holly need a male plant in the area so that the female plants will produce those beautiful red berries. If you buy holly, make sure you have the male plant as well. It will generally be smaller than the female and will not produce red berries itself. So plant it where it can pollinate the female plants but not where you expect a beautiful display.

Firethorn (Pyracantha) is a woody shrub that produces lovely flowers in spring and gorgeous clusters of yellow or orange berries in fall. The tall shrub (six to 16 feet) makes a lovely specimen plant or as part of a hedge. The evergreen plant is hardy in zones 6 to 9 (Long Island is zone 7). However, as its name implies, it’s filled with thorns. So, grow this beautiful and relatively carefree shrub knowing that the thorns can get you.

Devil’s walking stick (Aralia spinosa) is native to North America. So it can be found growing wild but not usually on Long Island. Some people like the unique plant (or small tree) with its white flowers in spring, which are followed by purple-black berries, and go out of their way to plant it. However, its name should make your aware of its nasty qualities, namely the horrible thorns along its stems. If you must add this to your garden, plant it in a remote area where no one can come in contact with those spines. Or, better yet, don’t plant it at all.

Research

With such easy access to information on the internet, no one should be making these, and other, gardening mistakes. Go to your search engine, type in the name of the plant in question together with a phrase such as “negative qualities” or “pros and cons.” Then check out the information and find out if you’re willing to live with the negatives. It may be worth it.

Mulberry is a weedy tree that drops fruit seemingly everywhere.
Mulberry is a weedy tree that drops fruit seemingly everywhere.

You may be willing to put up with the spiky seed pods of the sweet gum, or the long string beans of the catalpa, or the fruit dropping from a mulberry tree. You may like the fact that certain plants are slow growing and won’t take over your garden. Or you may want a fast growing plant to block out undesirable sights quickly. Make sure you know the final size (height and width) of a tree. Don’t plant a tree that easily spreads to 40 feet across right up against your house. Both the tree and the house will suffer.

Note that websites with extensions like .edu (colleges, universities, etc.) and .org (organizations) are most likely to give accurate, well-researched information. So, do your homework before you hit the nurseries. Then, ask them for their opinions. They may know, for example, that local deer love the buds of Montauk daisies, despite the fact that most websites say the plant is deer resistant.

Ellen Barcel is a freelance writer and master gardener. To reach Cornell Cooperative Extension of Suffolk County and its Master Gardener program, call 631-727-7850.

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The Catalpa tree has lots of small white flowers that resemble tiny orchids after the tree has leafed out. Photo by Ellen Barcel

By Ellen Barcel

There are two trees commonly seen on Long Island that look very much alike. They are both quick growing trees, with large heart-shaped leaves. Both have taproots. The major difference to the casual observer is that one has purple flowers in spring while the other has white flowers in early summer. The purple-flowered tree has round seedpods and the white-flowered tree has long string-bean-type seedpods.

Initially, many, many years ago, I assumed they were related, perhaps different varieties of the same tree. Wrong! What are these similar trees? The Royal Paulownia tree and the Catalpa tree.

Royal Paulownia Tree
Let’s start with the Paulownia (Paulownia tomentosa), also called the Empress tree and the Princess tree. The tree is a native of China and is extremely fast growing and a prolific producer of seeds. It is considered to be an invasive species, being brought to North America when the seeds were used as packing material for goods shipped from Asia. The seeds quickly took root and the tree has naturalized in North America. The wood of the Paulownia is used extensively in Asia for a variety of things.

Many people believe that it is an invasive plant, one that grows very quickly and therefore takes over forcing out the native species. As a result, it is listed on Suffolk County’s Management List of Invasive Species. It is recommended that it not be planted on Long Island especially near or on public land (see last week’s gardening column for details on the management list).

The purple flowers of the Paulownia tree come out before the leaves. Its bare branches and an evergreen tree can be seen in the background. Photo by Ellen Barcel
The purple flowers of the Paulownia tree come out before the leaves. Its bare branches and an evergreen tree can be seen in the background. Photo by Ellen Barcel

However, I recently came across several references to an article by Charles J. Smiley printed in the American Journal of Botany (1961) that the tree was actually native to North America as fossil leaves have been found from Washington State as far back as the Tertiary Period (66 million to 2.6 million years ago) and may have subsequently gone extinct here. Obviously, there is some disagreement among experts as the tree is still listed as invasive by a number of sources, including the New York Invasive Species Clearing House.

The American Paulownia Association can be reached at www.paulowniatrees.org. The group was “organized and developed through the joint efforts of the University of Tennessee and the University of Kentucky Extension Services” in 1991 and dedicated “to the advancement of Paulownia as a forest crop in the United States.”

The Paulownia prefers sun, grows in virtually any type of soil, is somewhat drought tolerant and does well in U.S. Department of Agriculture’s Hardiness Zones 5 to 11 (Long Island is 7). It has no significant disease or insect problems. The tree will even resprout from the root if cut down (remember that taproot), can reach heights of 70 to 100 feet and is long lived, reportedly from 60 to 100 years.

Catalpa Tree
The other tree, the Catalpa, is definitely native to North America. There are basically two varieties, northern (which grows here so well) and southern (which does well in warmer climates). Like the Paulownia, the tree is deciduous, losing its leaves in fall — quickly. In fact, it is one of the first trees to lose its leaves in fall.

The flowers of the Catalpa appear in late spring or early summer (mid-June this year) and resemble tiny orchids — white with purple throats — after the tree has leafed out. Like the Paulownia, the tree can reach a great height, easily up to 60 or more feet tall. The Catalpa grows well in hardiness zones 4 to 8. It does well in very acidic to neutral soil, pH 5.5 to 7.

The tree can be very long lived, reportedly 60 to possibly up to 100 years of age. One of mine died after about 25 years having been struck by lightning but did resprout from the root. Anthracnose (a fungal disease of some hardwood trees) can attack the leaves during very humid weather, but the tree itself usually survives quite well.

Because of its potential age, quick growth rate and hardiness, it makes a great shade tree. However, if you’re looking for autumn color, it will not provide it.

Ellen Barcel is a freelance writer and master gardener. To reach Cornell Cooperative Extension and its Master Gardener program, call 631-727-7850.