Monday, November 30, 2015

The Beauty of Autumn – and the Science Behind It

By Ashley Wong (T'16)

Culberson Asiatic Arboretum

Anyone who has taken a stroll through Duke Gardens within the past few weeks can resoundingly attest that fall is in full swing.

Now that the foliage has taken an autumnal turn and the air holds a pre-winter crispness, you may have wondered about the processes governing nature’s lovely color transformation that we witness at this time every year. It’s a phenomenon poignant enough to have inspired countless works of literature by writers and philosophers -- so poignant that renowned autumn-enthusiast Henry David Thoreau notably wrote an entire journal chronicling his observations of autumnal beauty as an homage to the season.

The Spring Woodland Garden

Unsurprisingly, the transformation of green leaves into sundry shades of red, orange, yellow, and brown has evolved into a particularly lucrative tourist attraction over the years. Autumn-inspired tourism, an activity so prominent that it has earned the name “leaf peeping tourism,” brings in approximately $1 billion dollars in revenue to North Carolina, a sizable chunk of its more than $20 billion dollar tourism income. Luckily for us, North Carolina seems to be a prime location for admiring fall foliage.

Blomquist Garden. Photo by Micaela Unda.
So what are the biochemical processes that lead to this revenue-boosting spectacle? Stefan Bloodworth, curator of the Blomquist Garden, who recently presented a lecture on the biochemistry of fall color for Duke Gardens volunteers, says that the onset of fall color is essentially a signal that photosynthesis has ended for the year.

As the number of daylight hours dwindles, the energy cost of photosynthesizing begins to climb since the inputs of sunlight and warmth that are necessary for photosynthesis are no longer steadily coming in. Thus, plants are triggered to stop producing chlorophyll, which absorbs red and blue light and reflects the leafy green for us to see. In addition, the plant grows a corky membrane between the leaf and the tree, essentially cutting off support of the leaf. At this point, we begin to see pigments that have been there throughout the growing season but were masked by chlorophyll the rest of the year.

One class of pigments, carotenoids, helps enhance the annual photosynthetic process by allowing the leaf to absorb light from the blue spectrum. Carotenoids have an additional part to play as well: acting in a photoprotective role throughout the growing season. Carotenoids protect leaves by cleaning up free oxygen radicals within the leaf. Also, as the level of sunlight declines, excess energy can build up and harm the leaf; carotenoids help in dissipating that energy as heat. This class of pigments is predominantly responsible for the vibrant orange and yellow hues associated with autumn foliage. 

But what about the purple and red colors? Anthocyanins, another class of pigments, are responsible for those hues, and they also emerge after photosynthesis ends and chlorophyll is no longer present. These pigments absorb blue-green light wavelengths, allowing the red wavelengths to be visible to us as red. Anthocyanins are also integral to photoprotection, acting as light screens to modulate light absorption and minimize the damage from too much sunlight. We have these molecules to thank for our visual and emotional pleasure every autumn. 

So even as the end of fall semester approaches and work inevitably begins to pile up (mercilessly so), take a minute to step outside and absorb the brilliant autumn coloration that is sure to surround you – believe me, it’ll be worth it.

Japanese maple in the Historic Gardens. Photo by Lori Sullivan.

Blogger Ashley Wong is a Duke senior majoring in environmental studies, with minors in biology and visual & media studies. She is also a Duke Gardens work-study marketing assistant. All photos by Ashley Wong except where noted.

Tuesday, November 17, 2015

Spotlight on: The Garden Guild

By Sarah Leach Smith

This holiday season, it’s all about local, handmade gifts. Shopping locally can seem daunting, especially when big-box stores are so easily accessible. But you don't need to look further than the Terrace Shop at Duke Gardens – here, you’ll find awesome gift ideas created with care by the Duke Gardens Garden Guild.

The Garden Guild started in the summer of 1999 to create garden-related crafts to sell at the fall plant sale to benefit Duke  Gardens. Their efforts were a great success, netting approximately $2,000 from their first sale! Since then, the Guild has become a popular fixture here at Duke Gardens.

Today, the Guild has 20 active members who meet Monday afternoons at the Gardens for crafting sessions. Each member has different experiences and talents, and they teach each other new skills to create beautiful, practical and one-of-a-kind items while having a great time socializing together.

This year, in lieu of the annual craft fair, you can find their unique offerings in the Terrace Shop year round. They are presently getting ready for the holiday season with tree ornaments, note cards (sold individually and in boxed sets), ceramic angel figurines and more. 

I recently had the opportunity to spend time with the Guild during one of their crafting sessions and was floored by the creativity and originality I saw. Come out and see their wares in the Terrace Shop. You are sure to impress a friend or loved one with a thoughtful, handmade gift. The Garden Guild brings out new items often, so be sure to check back regularly.

If you are interested in getting involved with the Garden Guild, we’d love to have you. Learn more about volunteering at Duke Gardens on our website. Happy Holidays!

Tuesday, November 10, 2015

Give the Gift of Duke Gardens!

By Sarah Leach Smith
There’s no denying the cooler temperatures and the falling leaves – the winter holidays are approaching. For many people, it’s a stressful time of year. What will I bring to the meal/give as a gift/wear to the party? Here at Duke Gardens, we may not be able to answer ALL of your questions, but we can certainly help with a few of these things.

Have you ever considered the gift of a Friends of Duke Gardens membership? It’s a wonderful idea for people who live in Durham or the surrounding areas. Because Duke Gardens is free for all visitors, more than half of our yearly operating budget comes from our members, who value all that this botanic garden has to offer.
Membership not only supports the future of Duke Gardens, but it also comes with great benefits for members. All membership levels include discounts for education programs and gift shop purchases, invitations to specials Friends of Duke Gardens events, reciprocal admission to nearly 300 gardens in North America and a copy of our annual Friends publication Flora.

To supplement the gift of membership, consider a special Duke Gardens souvenir item! In the Terrace Shop, we have a beautiful assortment of Duke Gardens books, mugs, T-shirts and 2016 calendars. We also have unique items handmade by the Garden Guild, a group of very crafty Gardens volunteers. Stay tuned for more information about these items.

If you’d like to give a gift of a Friends of Duke Gardens membership, please give us a call. Development Assistant Millicent Snow would love to hear from you and may be reached at 919-668-1711.

Happy Holidays!

Friday, October 30, 2015

Spotlight on Mums: from greenhouse to garden

Photo by Ashley Wong
By Micaela Unda

The Culberson Asiatic Arboretum is always a visual treat, particularly in fall, when green trees turn fiery orange and red, doubled by their reflection in the Asiatic Pond. But these last few weeks have brought an additional flourish of fall colors: show mums.

You'll find these long-stemmed chrysanthemums throughout the arboretum, but concentrated particularly in the new Pine Clouds Mountain Stream between the Japanese Pavilion and Flowers Drive. Pinks, oranges, yellows, whites, and with massive blooms, these stunning and photogenic flowers punctuate the landscape with cheerful pops of color.

This weekend will be the climax of the show mums' spectacle, with additional mums brought out from the Duke Gardens greenhouses. It's there where their lives begin, with staff horticulturists observing them carefully and taking detailed notes of their growth and health

The mums start from cuttings, says horticulturist Allison Vuyovich, who grew the flowers with fellow horticulturist Michelle Rawlins. "Then we pick three particular stalks that seem to be the strongest. You then let those grow up and stake them. Then we pinch the suckers and pinch off the buds." With  additional fertilizer, the buds and foliage grow large.

This is the second year that Duke Gardens has grown show-quality mums.  I enjoyed exploring the  aisles of the greenhouse, and seeing seeing the evolution of the plants as they blossom into the spectacular mums that earn their starring roles throughout the Asiatic Arboretum.

Garden-ready mums outside the propagation building.

The shapes and colors of the mums beg to be photographed, but learning how the mums are grown allowed me to truly appreciate their presence in the arboretum.

I hope you can visit Duke Gardens this weekend to appreciate these dramatic beauties, too!

Blogger and photographer Micaela Unda is a Duke University sophomore and a work-study marketing assistant at Duke Gardens. All photographs by Micaela Unda, except where noted.

Duke Freshmen, Stop and Smell the Roses!

The Blomquist Garden of Native Plants has many beautiful paths to explore.

By Cici Xie

So, you're in your first year at Duke, and you’re about halfway through your first semester. You’re probably starting to feel a bit overwhelmed with juggling schoolwork and other responsibilities. I get it. And I have three words for you: Visit Duke Gardens!

"How am I supposed to do that?" you ask. You have back-to-back classes starting at 8:30 a.m. and you don’t even have time to eat lunch before you have to go to a club meeting and then you have to go to practice, and by the time you’re back in your dorm it’s already 9 p.m. and you haven’t started your paper that’s due tomorrow and you have a quiz in math first thing in the morning, not to mention two midterms the day after, and you haven’t called your parents in who knows how long, and you’re running on nothing but 4 espresso shots.

Breathe. I get it.

Sarah studying in the Terrace Gardens.

I promise you that if you can make time to come to Duke Gardens, it will be worth your while. Take Sarah, for example. I found Sarah sitting next to the terraces working on an assignment for her creative writing class.

“I think everyone should take like one day out of their week to come, even if they aren’t nature people, because I think the Gardens offer so much for different kinds of people," she said. "And if you’re a social thinker, the Gardens offers an outside perspective more so than the regular quad would. And obviously if you like nature it’s just a great reset.”

 Faye on her way to class.
If that’s not convincing enough for you, here’s what Duke senior Faye said when I asked what she would tell freshmen:

"There’s way more to the Gardens than you probably see on a regular basis. I just started exploring the gardens more this year, and I found so many places I never knew were here. So I would definitely say even take a Saturday and just, like, go on a date in the Gardens, make your boyfriend or girlfriend or whatever take you around in the gardens. Go exploring. Go find every little nook and cranny of the gardens and just spend the day here.”

Consider visiting the ducks in the Asiatic Arboretum.

So yes, I know you’re crazy busy and you can barely find time to sleep. But next time you have to have a club meeting or you need to write a paper, consider doing it in Duke Gardens; I promise that you’ll feel much better.

Blogger Cici Xie is a Duke sophomore majoring in behavioral economics.