Archive for the ‘Leaves’ Category
Choosing Trees
One of the better parts of my work is buying trees; I buy lots of them. They may come from Oregon, or North Carolina, or Tennessee, or Macomb township just a few minutes from me. I do not own a nursery; I buy trees for specific projects. I choose based on what a client space and environment demands. The branch structure on these beech give me a great idea of their eventual shape. Jim’s son in the picture-I have a good idea of the size of these trees. As much as I would want to have one gorgeous specimen of every tree hardy in my zone, I have to make choices. These oval growing beech-perfect for a spot I am looking to plant.
Some trees can screen an untoward view. Other trees provide shade from the summer sun. Trees have function; a well placed tree can cut the temperature inside a home by plenty on a hot July day. Trees also delight the eye in a landscape, via their shape, stature, bark, blooms, leaves, berries. They are the giants of the garden-proper placement is essential. These cooly columnar European green beech would do a great service screening a neighboring play structure in a very narrow space-their architectural shape and bearing-a big plus. A straight European green beech-step aside, and provide lots and lots of room, and an equal amount of time.
White pine is the state tree of Michigan. In woods of age in the Upper Peninsula of Michigan, their open growth and gorgeous towering shapes are all anyone would ever need in a tree. Should you have acreage, that is. Sheared native white pine is just that-sheared. Columnar white pine is very unlike our native species. Elegantly tall and narrow, they can give a garden stature without bulk. I have seen white pines in Michigan that could easily shade my entire property-they are not for me. This edited version I could much more easily find a home for.
I have a great fondness for Katsura trees. Known formally as Cercidiphyllum Japonicum, their shape and quiet density make them one of my favorite trees. They have no blooms of note, but they do have extraordinary heart shaped leaves that are blue green, with veins decidedly purple. This coloration is unique to this species. These trees have been pruned; the effect is dense, and topiary-like.
Liriodendron tulipfera, or tulip tree, is one of the largest growing trees in North America. Their green and orange tulip shaped blooms are lost on most. The trees do not begin blooming until they are old, and very tall. You need to stand off, with a spyglass, to appreciate this blooming part. I have a client with screened porches high in the air-I should talk to her about these trees. The columnar tulip tree you might be able to handle. The same smooth grey bark, the same luscious palmate leaves-in a narrow version.
This untrimmed katsura presents very differently than those that are pruned. Many trees are seed grown, producing great variation from tree to tree. If you are looking for a tree, look in person. Even a young tree will give you a hint as to what it will become. Make friends, then buy.
These espaliered Bradford pears I am considering buying-with no project in mind. I think I might just have to have them. They are old enough to stand on their own-no structure needed. This winter aspect makes my heart pound. How they catch the snow-so beautiful. It is a sign, when you don’t think you can live without something. These trees have that feeling.
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Come spring, they will enchant a space. Most of the trees I have pictured here would work in small gardens, or tight spaces. No need to deny yourself trees. Gardeners can be so funny. First off, they want the plants they can’t have. Take the time to figure out exactly what it is you like. Once you figure out what it is that moves you about a plant, or a tree, I am sure there is something out there that will be just perfect.
Parthenocissus Tricuspidata
I have never forgotten my ninth grade science teacher, Dr. Watson. He concluded every lecture or discussion with the statement, “And that is the beauty of science”. Though at the time I thought he was a crackpot, I now know he was absolutely right. Today I am thinking about Parthenocissus Tricuspidata; Boston Ivy is an ordinary plant with a fancy scientific name whose primary claim to fame is its ability to grip to and cover walls with dense sheets of leaves. Why today? The fall color of Boston Ivy is one of nature’s most spectacularly glowing moments, ranking right up there with the aurora borealis.
One wall of the building next door to me sits right on my property line; that would be just about two thousand square feet of beige concrete block. Needless to say, I was not too crazy about the look. Five Boston Ivy plants have just about transformed that wall in four years time; today it is looking exceptionally good. The science behind all this color-the formation of the abcission layer. Don’t black out; I’m talking about the beauty of science here. As soon as the nights get long enough in the fall, the cells that connect the leaves to the stems begin to rapidly divide-but they do not expand. This produces a brittle callus, which slows, and finally prevents the flow of nutrients from the stem to the leaves. The plant is going dormant, and putting any expenditure of energy on hold. This is a survival mechanism, the instinct to preserve life, and the beauty of science.
At the same time, the leaves slow down and eventually quit producing chlorophyll-that chemical that makes leaves green. If chlorophyll is not constantly manufactured in a leaf, the leaf will fade in sunlight. Chlorophyll masks the other pigments existing in leaves; the yellows, oranges and reds that were there all along are revealed when the production of chlorophyll ceases.
Though day length triggers this process, the temperatures, the moisture in the soil, and sunlight influence the overall show. A dry growing season can encourage leaves to drop early before they reveal any color. High winds can sever the dry corky abscission layer with the same result. At any rate, the variation and intensity of color on this wall is different every year given weather conditions. I can see that light, water, wind, sun and overnight temperatures affect the leaves on wall at different rates.
It is easy to see the chlorophyll fading at different rates in different leaves-the color variation within each individual leaf is beautiful.
Anthocyanins are responsible for the red and purple pigments in leaves. They are manufactured from sugars that are trapped in the leaf. Oddly enough, these pigments are not present in leaves during the growing season. The role of these pigments is not so well understood. If you are interested in reading more about it, The United States National Arboretum has an excellent article on line about the science of color in autumn leaves.
Metasequoia Glyptostroboides-I wish this were my name. The Dawn Redwood is an ancient evergreen tree with a twist; it drops its needles in the fall, after turning this glorious peachy orange. This deciduous evergreen is an anomaly amongst evergreens, which ordinarily hold their foliage all winter.

The brilliant colors of fall leaves holds but a very short time. These pigments break down when exposed to light, or heavy frost. The brown color you see in these leaves is a result of the only pigment left-the tannins. The story of parthenocissus is not only about the beauty of science. It is just as much the story of the miracle that is nature.
More Ado About Leaves

The fact that not all foliage is “green” comes as no surprise to any gardener. Modern hybridization of plants has produced some truly unusual leaf coloration. The numbers of coleus hybrids available has dramatically increased, although the nomenclature is confusing, and some colors go beyond moody to just plain muddy. This sparkling variety has clear, brilliant color, and a luxuriant habit of growth. I do like plants that make me look like a good gardener. �

Even the red and orange coleus varieties seem to have much improved coloration and habit. Plant hybridizers work very hard. �

The toothy leaves of this coleus variety are unique; the lime centers only make the orange seem more orange. Supremely orange. �

This green and white variegated hibiscus is notable for its leaves, rather than its flowers. The occasional red blooms are a pleasing surprise. A red-stemmed, variegated leaf hibiscus that grows large and vase shaped gets my attention ahead of the big flowered tropical hibiscus. Why is this?; see for yourself. �

This small leaved coleus the color of butterscotch has a good companion in this tree fern. Though tree ferns can grow to 18′ tall in New Zealand, a one gallon size plant makes a good show in a container over the course of a Michigan season. The exotic and unexpected appearance of foliage of another color can create drama and interest in public places. Who would think a diminutive thread leaf alternanthera could make such a big statement in the same pot with a giant canna? This is about the good fun that gardening can be. Who knew this pot would grow out better than I thought it could be?
The incredible range of plant material available guarantees that no annual gardener need ever repeat themselves. It occurs to me that much of what I am able to do depends on the people in my area who grow plants. They test different things, they make the tried and true available, they see to it that I am able to work. They get out of bed on a Sunday at 3am when the heat in a greenhouse goes off. They are gardeners of a different sort. They depend on the plants to pay their mortgages, and educate their children. I support my local growers; I hope you do too. �











