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Posts tagged “Acer saccharum

Early Splashes of Maroon

10-6-16-white-ash-leaves-20161005_4124At this time of year, our eyes are immediately drawn to the brilliant orange, red and yellow pigments of Sugar Maple (Acer saccharum) leaves. However, there’s much to be said about the less flamboyant splashes of color adorning some of the species of trees that provide New England’s spectacular fall foliage. One such subtley-colored fall tree that often grows in upland forests along with Sugar Maples is White Ash (Fraxinus americana). One of the first trees to change color in autumn, White Ash can turn shades of yellow, orange and red, but deep red, maroon and purple are typically the grand finale of this species. Often its leaves progress from green to yellow and eventually maroon.  While it might not be the first tree that catches your eye, make a point of looking for its colorful, compound leaves – you won’t be disappointed.

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Bud Scales

bud scales 147Much of this coming summer’s woody plant growth is contained in embryonic form inside a tree’s buds. Buds contain an undeveloped shoot, leaf, and/or flower. Formed last summer, these buds must survive the freezing and fluctuating temperatures, relatively dry air and the potential insect, bird and fungal damage that may occur during the fall, winter and early spring.

Bud scales, which are small, modified leaves, cover and protect many of these buds. The number of scales, their arrangement, color, presence or absence of hairs or sticky substances are often distinctive. Willows have one visible bud scale (actually two fused into one), whereas pine and fir buds may have anywhere from 100 to 350. The scales on a bud can either be arranged in pairs facing each other edgewise (American Basswood, pictured) or overlapping like shingles (Sugar Maple, pictured). Colors range from the wine-colored bud scales of Striped Maple to the mustard yellow Bitternut Hickory scales. The texture of bud scales has great variation, including the satiny-smooth hairy bud scales of Box Elder (pictured). Many bud scales, such as poplars, are covered by a gummy substance which serves as added protection.

A few trees and shrubs have buds that lack scales. These are referred to as “naked” buds, and often the embryonic leaves are quite hairy. Witch Hazel, Hobblebush and Staghorn Sumac (pictured) are species of woody plants lacking bud scales.

Most buds have multiple scales which, upon falling off when the bud opens, leave a series of horizontally-elongated scars on the surface of the growing stem. By means of these scars one can determine the age of a young branch, since each year’s growth ends in the formation of a terminal bud which produces an additional group of bud scale scars. Continued growth of the branch causes these scars to be indistinguishable after a few years so that the age of older branches cannot be determined by this means.

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Sugar Maple Seeds & Sap

4-8-15 sugar maple & pail 226Cold nights and warm, sunny days increase the amount of the sap flow in a Maple Sugar tree, making weather an important factor in the quality of a sugaring season. But it’s not the only factor. Both the amount of sap flowing as well as its sugar content affect a given season’s maple syrup production.

Recent research indicates that the size of a tree’s seed crop in the fall is a good predictor of the sugar content of its sap the following spring. A tree, through photosynthesis, produces and stores a given amount of carbohydrates. These carbohydrates are utilized in the production of seeds as well as the production of sugar. Once the carbohydrates are used up, over a year is needed for the tree to replace them. If a lot of seeds are produced in the fall, there are fewer carbohydrates available for the production of sugar the following spring. Hence, while the weather in a given spring may be conducive for the ample flow of sap, the sap that flows may have a very low sugar content if a tree produced a lot of seeds the previous fall, making it necessary to boil more sap to achieve the desired sugar content in the maple syrup. (Source: Northern Woodlands magazine)

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Red Squirrels & Sugar Maples

2-20-15 red squirrel2 IMG_7851We’re approaching what is often a very stressful time of year for many animals, including red squirrels. In the fall they feed on all kinds of conifer seeds, mushrooms, insects, nuts and the many fruits and berries that are available. They also have caches of cones, which they turn to once there is a scarcity of food elsewhere.

Once these caches are used up, usually by late winter or early spring, red squirrels turn to sugar maples for nutrients. Their timing is perfect, for this is when sap is starting to be drawn up from the roots of trees. Red squirrels are known to harvest this sap by making single bites into the tree with their incisors. These bites go deep enough to tap into the tree’s xylem tissue, which is where the sap is flowing. The puncture causes the sap to flow out of the tree, but the squirrel delays its gratification. It leaves and returns later to lick up the sugary residue that remains on the branch after most of the water has evaporated from the sap.

Not only do red squirrels help themselves to sugar maple sap, but they have developed a taste for the buds, and later in the spring, the flowers, of both red and sugar maples. Red squirrels are not the only culprits – gray squirrels and flying squirrels also make short work of buds and flowers from these trees.

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Ice-coated Tree Buds

1-5-15  ice-covered sugar maple buds 170Recently freezing rain coated trees with ice and the sight reminded me that when a freeze is threatening fruit trees in the spring, just as buds are breaking, orchardists often opt to replicate this phenomenon by starting a sprinkler and coating their trees with ice. Flower buds that are starting to open can be extremely temperature sensitive, suffering damage when it goes below freezing even temporarily. As counter-intuitive as it seems, a properly maintained layer of ice works well to protect opening buds from the cold. When water freezes, heat is produced at a rate of 80 calories per gram of water (the heat of fusion). If water is continually applied to the tree and consistently freezes, it is possible to maintain the buds around 32 degrees F., thereby protecting the flowers within them. (Photo- sugar maple terminal buds)

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Full Moon

Newly-emerged Sugar Maple leaves in last night’s full moon.


Sugar Maple Buds & Bark

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Maples have what is referred to as “opposite” branching – the buds, leaves and branches are positioned opposite one another. If you look at this photo of the terminal bud of a sugar maple (Acer saccharum) you’ll see that the two lateral buds (on either side of the terminal bud) are directly across from each other.  This is relatively rare in the woody plant world — you’ve narrowed down the identity of a tree significantly if you determine that it has opposite branching (ashes and dogwoods, among others, share this characteristic). The buds of sugar maple are pointed.  The appearance of its bark depends on the age of the tree you’re looking at.  Saplings and younger branches are quite smooth (right branch in photo), whereas the bark of an old sugar maple is furrowed with vertical ridges curled outward along one side (left side of photo).