Buds

I’ve spent many winters watching the buds of trees and bushes, especially those right around my house like the lilac (Syringa vulgaris) in the above photo. I check it regularly starting in February for signs of swelling. In winter buds are my connection to spring and I love watching the bud scales finally open to reveal tiny leaves or flowers. Bud scales are modified leaves that cover and protect the bud through winter. Some buds can have several, some have two, some have just one scale called a cap, and some buds are naked, with none at all. Buds that have several scales are called imbricate with scales that overlap like shingles. A gummy resin fills the spaces between the scales and makes the bud waterproof. This is especially important in cold climates because water freezing inside the bud scales would destroy the bud. The lilac bud above is a good example of an imbricate bud.

For those who can’t see or don’t want to look at small buds like lilacs fortunately there are big buds on plants like rhododendron. It also has imbricate buds. This one was half the length of my thumb.

Buds with just two (sometimes three) scales are called valvate. The scales meet but do not overlap. This Cornelian cherry bud is a great example of a valvate bud. In the spring when the plant begins to take up water through its roots the buds swell and the scales part to let the bud grow. Some bud scales are hairy and some are covered with sticky resin that further protects the bud. I was surprised to see the bud scales on this example opening already. We can still get below zero cold.

Cornelian cherry (Cornus mas) is an ornamental flowering shrub related to dogwoods. It blooms in early spring (in March) with clusters of blossoms that have small, bright yellow bracts.

Native nannyberry buds (Viburnum lentago) are also examples of valvate buds. These buds always remind me of great blue herons or cranes. The bottom bud scale was broken on this one. Nannyberry is another of our native viburnums but unlike many of them this shrub produces edible fruit. Native Americans ate them fresh or dried and used the bark and leaves medicinally.

Staghorn sumacs (Rhus typhina) have no bud scales so their naked buds are hairy and the hairs protect the bud. Another name for staghorn sumac is velvet tree, and that’s exactly what its branches feel like. Native Americans made a drink from this tree’s berries that tasted just like lemonade, and grinding the berries produces a purple colored, lemon flavored spice.

Hobblebush (Viburnum lantanoides) is another native shrub with naked buds. This photo shows that the flower bud in the center and the two leaf buds on either side are clothed more in wool than hair, but there are no scales for protection. Still, they come through the coldest winters and still bloom beautifully each spring.

Magnolia flower buds in botanical terms are “densely pubescent, single-scaled, terminal flower buds,” which means that instead of using scales or hairs they use both. The hairy single scale is called a cap and it will fall off only when the bud inside has swollen to the point of blossoming. Meanwhile, the bud stays wrapped protectively in a fur coat.

Red oak (Quercus rubra) buds usually appear in a cluster and are conical and reddish brown. I like the chevron like pattern that the bud scales make. Red oak is one of our most common trees in New England but in the past many thousands were lost to gypsy moth infestations. It is an important source of lumber, flooring and fire wood. The USDA says that red oaks can live to be 500 years old.

Terminal buds appear on the end or terminus of a branch and nothing illustrates that better than the sugar maple (Acer saccharum.) The large, pointed, very scaly bud is flanked by smaller lateral buds on either side. The lateral buds are usually smaller than the terminal bud. Sugar maple twigs and buds are brown rather than red like silver or red maples. In 2016 New Hampshire produced 169,000 gallons of maple syrup but the season only lasted through the month of March due to the warm weather. The average cost per gallon in 2015 was $59.40. I’m guessing it went up in 2016.

Striped maples (Acer pensylvanicum) have colorful twigs and buds and are among the easiest trees to identify no matter what time of year because of the green and white vertical stripes on their bark. Their terminal buds have two scales and are valvate like the nannyberry buds. Striped maple is very fussy about where it grows and will not stand pollution, heat, or drought. It likes cool, shady places with sandy soil that stays moist. They bloom in June and have very pretty green bell shaped blossoms.

Striped maple bark makes the trees very easy to identify when they’re young, but as trees age the bark becomes uniformly gray.

The bud I’m probably most looking forward to seeing open in spring is the beech (Fagus grandifolia.) There are beautiful silvery downy edges on the new laves that only last for a day or two, so I watch beech trees closely starting in May. Botanically beech buds are described as “narrow conical, highly imbricate, and sharply pointed.”

It was about 15 degrees and snowing when this photo was taken and you can see the frozen gummy resin that glues some bud scales together on this gray birch (Betula populifolia) bud and male catkin on the right. Ruffed grouse will eat the buds and catkins and. pine siskins and black-capped chickadees eat the seeds. Yellow-bellied sapsuckers feed on the sap and I’ve seen beavers take an entire clump of gray birch overnight, so they must be really tasty. Deer also browse on the twigs in winter.

Black birch buds (Betula lenta) don’t have as many bud scales as gray birch buds and the bark doesn’t look at all like other birches, so it can be hard to identify. Another name for the tree is cherry birch and that’s because its bark looks like cherry bark. It is also called sweet birch because it smells like wintergreen, and I always identify it by chewing a twig. If it tastes like wintergreen then I know it’s a black birch. Trees were once harvested, shredded and distilled to make oil of wintergreen. So many were taken that they became hard to find, but they seem to be making a good comeback.

Everything about the northern catalpa (Catalpa speciosa) tree is big. It grows to 70-100 feet and has huge heart shaped leaves. Great trusses of large white orchid like flowers blossom appear on them in late spring, and even the seedpods look like giant string beans. But then there are its buds, which are tiny. In this photo the brown leaf bud appears just above the suction cup like leaf scar, which is where last year’s leaf was. Each tiny bud has about six small pointed scales. Catalpa wood is very rot resistant and railroads once grew large plantations of them to use as rail ties. It has also been used for telephone poles. The word catalpa comes from the Native American Cherokee tribe.

Catalpa trees have the biggest leaves of any tree I know of. This shot of my camera sitting on one is from a couple of years ago. It’s amazing that such a big thing can grow from such a tiny bud.

Clusters of small, sticky buds appear at the ends of white pine branches (Pinus strobus.) They are sticky because they’re coated with pine sap, which we call pine pitch. They aren’t sticky when it’s cold though; the white platy material is frozen pine pitch. Once the weather warms it will go back to being a thick, amber, sticky fluid that doesn’t easily wash off.

I have to apologize for the quality of some of these photos. With it dark before and after work these days photography can only happen on weekends and if it’s dark and cloudy on those days then I have to assume that nature is giving me a lesson in great patience and I just have to do what I can with the camera.

Despite the poor photos I hope this post has shown how interesting and beautiful buds can be, and I hope you’ll have a look at the buds in your own yard or neighborhood. You might be very surprised by what you find.

Leaves wither because winter begins; but they also wither because spring is already beginning, because new buds are being made. ~Karel Capek

Thanks for coming by.

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