- Author: Janet Hartin
Welcome to Fall!
It's my favorite season and likely for many of you, as well. Beyond the holidays and extra time with family and friends, nature radiates its beautiful hues. In addition to lovely foliage, deciduous trees often expose exquisitely shaped and sturdy trunks. And, of course, there is the lovely fall foliage showcased by many species.
Did you ever wonder why trees "turn" color in the fall? The short answer: It's primarily a function of long, cool fall nights and short, sunny days. The longer answer? Chlorophyll is responsible for the basic green color of leaves we see in spring and summer and is a necessary component of photosynthesis, which uses sunlight to manufacture sugar (food) that is stored during the dormant period of the year. Carotenoids produce yellow, orange and even brown pigments in crops such as carrots, squash, bananas and many ornamental plants such as daffodils and poppies. Anthocyanins are red and orange in color and are most linked to lavish displays of brilliant fall foliage. They also give rise to coloring of strawberries, plums and cherries.
Here's the kicker: While chlorophyll and carotenoids are present in leaf cell chloroplasts throughout the entire growing season, during fall chlorophyll begins to break down. Voila! The lovely yellow and orange hues we all look forward to seeing are finally exposed. In addition, red hues (called anthocyanins) are produced in fall. So, in reality foliage doesn't "turn" orange or red at all.
Interestingly, the actual timing of color change varies across species and appears to be genetically inherited. The same species will exhibit a similar color scheme in cool temperatures in higher elevations at nearly the same time as it does in warmer lower elevation climates.
The intensity of color can vary quite a bit however. Where do temperatures enter the picture? Both the amount of color and the overall intensity of fall color is very linked to weather conditions that occur prior to and during the actual time the chlorophyll in leaves winds down. The most brilliant displays occur after several warm, sunny days and cool, crisp (above freezing) nights. This is because although lots of sugars are made in leaves during sunny daytime hours, the corresponding cool nights prevent the sugars from moving out. The amount of soil moisture also helps ensure that from year to year fall colors vary even in the same trees. So, either a late spring or a prolonged drought can both delay the display of fall color by a few days or even a few weeks.
What's the recipe for the most brilliant fall display? Most likely a warm, moist spring followed by a warm summer and sunny fall with cool autumn nights. Although fall color is not nearly as spectacular in lower elevations of Southern California compared to other colder areas of the nation, the liquidambar or American sweet gum (Liquidambar styraciflua) offers some pretty impressive fall color and an impressive 300 to 400-year life span. (Did you know that liquidambar got its name because it at one time was a sought-after chewing gum for Native Americans?)
Two “climate-ready” tree species with lovely fall foliage that grow in both the west portion of the county and the desert are the ‘Keith Davey' Pistache, a large street and park tree sporting crimson to scarlet colored foliage and its relative, the ‘Red Push' Pistache, a hybrid between P. atlántica x P. integerrima) which has lovely red foliage as it emerges in Spring as well as Fall. Others include the Raywood Ash (Fraxinus oxycarpa 'Raywood') sporting a reddish-purple hue in the fall, and the ‘Sunburst' Locust (Gleditsia triacanthos var. inermis 'Sunburst') which offers a vivid display of fall color. Unfortunately, it is susceptible to the Invasive Shot-Hole Borer. If you have one of these lovely trees already, take good care of it to help it stand up to this aggressive pest!
Happy Fall! Enjoy the cooler weather, family and friends, and lovely trees!
- Author: Mike Hsu
CalFresh Healthy Living, UC and UC Master Gardeners partner with nonprofit MORE in El Dorado County
A nonprofit serving adults with intellectual and developmental disabilities in El Dorado County, MORE has found kindred spirits in helping their clients live fuller and healthier lives – the staff and volunteers of University of California Master Gardeners and CalFresh Healthy Living, UC.
Since 2018, these programs – both affiliated with UC Agriculture and Natural Resources – have helped enrich the lives of about 60 clients at MORE, which offers services ranging from independent-living skills development to job training and placement.
“This is exactly the kind of partnership that we like to make with the community,” said MORE CEO Susie Davies, who has been with the Placerville-based organization for 40 years. “This has just been incredible; our people have learned above and beyond what we could even have imagined in nutrition and gardening.”
The three-party partnership, which Davies calls a “win-win-win,” offers a course that combines gardening and nutrition lessons, as well as a new cooking and food safety-focused class developed by educator Cailin McLaughlin in collaboration with MORE staff.
During one session, MORE clients enjoyed preparing a “plant part salad,” following a botanical lesson on the edible components of plants – fruits, roots, leaves, seeds and stems. “It was fun to cut the celery and broccoli,” said Jared (first names are used to protect privacy). “I like pouring the sauce in.”
“I liked everything about creating the salad,” said Deanne, another participant.
“MORE is the dream site, the best you could ever hope to go to, with the programming and the clients always being lovely and really just being down for anything,” said McLaughlin, a CalFresh Healthy Living nutrition educator at the Central Sierra UC Cooperative Extension office. “It's just a really cool place to be.”
CalFresh Healthy Living, UC is one of the organizations in California that teaches nutrition to people eligible for SNAP (Supplemental Nutrition Assistance Program). UC Davis administers the SNAP-Ed grant and UC Cooperative Extension educators deliver the lessons throughout the state.
‘Part of our MORE family'
Through the gardening and nutrition program, clients learn and apply their skills in the garden and greenhouse at the MORE facility and in the nearby Sherwood Demonstration Garden maintained by UC Master Gardeners of El Dorado County.
“The participants get a chance to harvest, plant, pull weeds and learn about integrated pest management, both in the vegetable garden and in the orchard,” said Tracy Celio, the local UC Master Gardeners program manager who worked with former CalFresh Healthy Living, UCCE educator Miranda Capriotti to develop the program.
“It's a very good program,” said Tony, a MORE client. “I can learn things.”
While experiencing the pride in bringing fresh produce to their home or to the MORE kitchen for use in the meal service, the clients are also taking away nutritious and healthy recipes. Jordan Postlewait, director of community access programs at MORE, said participants now know how to use ingredients from the garden to create dishes such as tomato salsa and fruit salad.
“They've taken the recipes that Cailin has given them and they go home and serve their whole group home what we had made for a snack,” Postlewait said. “They are paying attention to what they're eating.”
As a result of this awareness and knowledge of nutritious foods, Davies said that MORE clients are healthier, more energized and alert, and ready to learn. She is quick to credit the expertise and enthusiasm of McLaughlin, CalFresh Healthy Living, UCCE program coordinator Mariana Garcia, and the UC Master Gardeners staff and volunteers.
“They have the same dedication and commitment to excellence in their preparation for every session as our staff,” Davies said. “They just became part of our MORE family.”
“I like seeing Cailin and Tracy and all the staff who are my friends,” said Kenion, a MORE client.
Cooking lessons create possibilities for kitchen time, jobs
In April, two groups, each composed of six people, began participating in a new five-session course combining nutrition, food safety and basic cooking techniques. Each two-hour session included a nutrition lesson, a physical activity and time in MORE's commercial kitchen.
“It was fun getting in the kitchen and learning how to prepare my own meals,” Jared said. “I learned how to safely use a small skillet.”
Another participant, Kyle, said he uses the recipes to cook for his roommates. “I liked learning new cooking skills and recipes,” he said.
McLaughlin adapted a youth-oriented healthy eating curriculum, approved for use by CalFresh Healthy Living, UC, and tailored it for adults at MORE.
“The whole goal is to get them closer to an independent living circumstance, where either they can live in a group facility or have their own apartment – and knowing how to cook and identify healthy recipes is a huge component of that,” McLaughlin explained.
The guided kitchen experiences – and equipment like plastic safety knives – not only benefit the participants but also give their family members reassurance and confidence to include them in meal preparation.
“We've actually been asked by staff at MORE, and also by clients' parents, where we got the knives, because they would like to have their family member in the kitchen with them, if they can do it safely,” McLaughlin said. “They didn't know things like safety knives existed; they didn't know you could adapt a silicone food guard to keep them from burning themselves on a burner.”
In addition to enhancing the clients' family time, the cooking lessons could also set them up for future employment. Davies said she is in talks with a local chef about establishing a culinary training for the clients.
“This cooking program could be a preparation program for them to be involved in the culinary training program,” she said. “That's what we're really excited about.”
McLaughlin added that, for future sessions of the cooking and food-safety series, past participants have expressed interest in serving as kitchen aides and mentors.
Partners nurture clients' relationships with nature, community
Empowering clients with new skills and fostering a sense of ownership of the garden are both cornerstones of the partnership programs. Beginning in 2019, participants from MORE each adopted a tree in the Sherwood Demonstration Garden orchard to monitor and nurture.
“Almost every time they come to the garden, we check those fruit trees,” Celio said. “The trees are doing so many things throughout the year, so they're following the cycle: they watch the leaves drop; they watch the fruit come in; they see what a freeze does to their tree; they see what pests do to their tree.”
The participants experience the challenges of gardening – from managing rabbits and squirrels to coping with the loss of a pear tree due to disease – as well as its many joys.
“I liked seeing the butterflies and different plants; the butterflies drink from the bushes,” said Jen, a MORE client. “My favorite thing is the rose garden.”
At the same time, the clients have built strong relationships with the core group of UC Master Gardener volunteers and the dozen or so “vegetable garden crew” volunteers. Celio stressed that the garden programs, which were recently recognized by the statewide UC Master Gardeners program with a Search for Excellence Award, are truly collaborative.
MORE participants often bring their own ideas; one man, for example, became interested in composting and worked with MORE staff to establish a worm bin at the MORE facility garden.
“Every time I see that client, he will tell me how the worms were doing and he'll tell me how healthy the plants are that are growing next to the worm bin,” Celio said, adding that he also worked at a table during a MORE fair, teaching other clients and their family members about vermiculture.
Advocating for the greater good of the community is central to another CalFresh Healthy Living, UC collaborative project at MORE, in partnership with Stanford University's Our Voice initiative. Using an online tool and app, 12 clients have been taking photos and sharing feedback on their health and wellness experience at MORE, specifically about their walking trail. With that information, they are building a case to make the path safer and more enjoyable.
Responding to their feedback, along with the other partnership programs that are building vital skills and community, demonstrate to MORE's clients that they are appreciated and respected.
“The request from the people that we serve is that they want to be seen, they want to be heard, and they want to be valued by other community members,” Davies said. “And this is really showing them that they are valued and being seen and heard.”
- Author: Saoimanu Sope
Besides starting fires for the sake of research, Luca Carmignani, UC Cooperative Extension fire advisor for San Diego, Orange, Los Angeles, and Riverside counties, has started leveraging his connection to local UC campuses by providing opportunities for hands-on learning.
Early one morning in May, students and staff from UC Irvine and UC Riverside gathered at the South Coast Research and Extension Center to collect data for their own research projects. South Coast REC, located in Irvine, is part of a statewide network of research and education facilities operated by UC Agriculture and Natural Resources.
In one area of the field, graduate students picked leaves and twigs from dried shrubs, carefully placing them in a device that measures moisture content. In another area, a postdoctoral scholar set up a device that records levels of particulate matter, carbon dioxide and other air pollutants emitted by a fire.
Tirtha Banerjee, professor in the Department of Civil and Environmental Engineering at UC Irvine, coordinated the field day with Carmignani. The two first connected as members of iFireNet, an international network of networks that connect people to fire research, when Carmignani was a postdoctoral researcher at UC Berkeley.
Now, the two are collaborating to help environmental science and engineering students realize the potential of their research interests.
Jacquelynn Nguyen, a Ph.D. student in the Civil and Environmental Engineering department at UC Irvine, is interested in understanding how ash from wildfires and prescribed burns can be used as a treatment for per- and polyfluorinated substances. PFAS are a group of “forever chemicals” that can be found in heat-resistant materials – including fire extinguisher foam – and are extremely difficult to eliminate.
Before Nguyen could collect her ash samples, Carmignani needed to cautiously set the dried shrubs on fire, providing a realistic situation for data collection purposes.
“We're trying to figure out if the ashes from these fires can be used as activated carbon, which could be used as a treatment for PFAS,” said Nguyen. “We want to see if this treatment can basically absorb PFAS and prevent it from traveling into soil and groundwater.”
While Nguyen is concerned about the impact that wildfires have on the land, Soroush Neyestani, a postdoctoral scholar in the Environmental Sciences department at UC Riverside, is interested in its impact on the air quality.
During a fire, it's difficult to determine how much emissions are a result of flames versus smoldering, the process of burning slowly with smoke but no flames, and current air quality models do not provide accurate guidance on this matter. Using an air quality sensor, Neyestani wants to quantify the difference in emission levels during the two phases.
“There are assumptions that 50% of emissions come from smoldering, but every fire is different. Our main objective is to improve the accuracy of air-quality forecasting,” Neyestani said, noting his concern that these assumptions might not be realistic.
Although the field day was created with the students in mind, Carmignani used the opportunity to polish his own research efforts. Since fall 2022, he has been investigating the flammability of low-water use landscape plants based on various irrigation applications.
“Every time we burn, I feel like we get better. We get better data, and we conduct better analysis, and that's really important for us so that we can figure out how we can apply our research and measure its outcome,” said Carmignani.
In addition to welcoming more collaborations with UC campuses and other organizations, Carmignani is hopeful that these combined research efforts will spark an interest in wildfire awareness everywhere.
- Author: Anne Schellman
What is a Deciduous Fruit tree?
Deciduous fruit trees lose their leaves in fall, and include apple, pear, fig, pomegranate, nectarine, cherry, apricot, peach, and plum.
Planting New Trees & Understanding Where Fruit Originates
Sometimes a fruit tree mysteriously dies, and the gardener isn't sure what happened. A common cause is a tree that was planted too deeply. Root and crown rot slowly affect the tree, causing it to die years later. Watch the detailed instructions on how to plant correctly.
It's important to understand how new fruit develops and grows on the tree. Not all deciduous fruit trees produce fruit in the same place. It's important to know this so you don't accidentally cut off fruit spurs and damage your tree's ability to produce fruit. See this video for guidance. https://www.youtube.com/watch?v=-4fgVrf8XHE&t=250s
Publication - Fruit Trees: Planting and Care of Young Trees https://anrcatalog.ucanr.edu/Details.aspx?itemNo=8048
Fruit Trees: Training and Pruning Deciduous Trees https://anrcatalog.ucanr.edu/Details.aspx?itemNo=8057
Keeping New Trees Small – the Fruit Bush Method
Tired of out-of-control fruit trees? If you are planting a new tree, watch this video! It details the Fruit Bush Method, a specific way of keeping fruit trees small. See photos of 5-6' tall fruit trees planted over 30 years ago that continue to produce an ample amount of fruit. https://www.youtube.com/watch?v=ry4YAp6NzdI&t=1s
Pruning Established Trees
Other Helpful Publications
Fruit Trees: Thinning Young Fruit https://anrcatalog.ucanr.edu/Details.aspx?itemNo=8047
What about Citrus Trees?
Citrus trees such as oranges, lemons, grapefruits, lime, and kumquats are evergreen trees and need different care than deciduous trees. It's not recommended to prune citrus trees at the same time as deciduous fruit trees. Wait until spring to prune your tree for size and shape.
We are offering an online class on citrus on January 31, so watch for our registration advertisement in about a week. Locally, we will be teaching at 8 library locations about citrus during March.
- Author: Janet Hartin
Fall is a great time to plant trees in our urban landscapes. Temperatures are cooler than summer and trees adjust to transplanting much better than during the heat of summer.
Why trees? Trees reduce surface temperatures of asphalt and other dark impervious surfaces by over 60 degrees F in inland cities during spring and summer. They also reduce energy usage and costs, enhance habitat and pollinator populations, absorb and store carbon dioxide, provide oxygen for our subsistence, reduce erosion, reduce glare and noise, add beauty to our neighborhoods, and enhance mental and emotional health.
I am appreciative to UCCE San Bernardino County Master Gardener trainee Alex Shippee for his graphic design wizardry, making a drab publication on planting trees inviting and appealing to read.
Have more questions about your trees? Contact the UC Cooperative Extension Master Gardener tree helpline in San Bernardino County. 22trees4tomorrow@gmail.com or our general telephone helpline at (909)387-2182 or email mgsanbern@ucanr.edu where your gardening questions can also be addressed. (You will also reach this website by following the QR code link above.) We also have this handout available in Spanish.
