- Author: Saoimanu Sope
In a drought-prone region like Southern California, working with Mother Nature is not only wise but necessary, according to Janet Hartin, UC Cooperative Extension horticulture advisor for Los Angeles, San Bernardino and Riverside counties, who studies climate-ready trees.
In 2020, Governor Newsom launched the California Climate Action Corps, empowering Californians to protect their communities from the impacts of climate change. Newsom's call to action emphasizes the need for...
- Author: Janet Hartin, UC Cooperative Extension Environmental Horticulture Advisor
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...
- Author: Janet Hartin
- Author: Ricardo A. Vela
Partnering for California
Spring 2021 proved to be one of the hottest in California, breaking heat records in several cities. It was a perfect opportunity to plant “climate-ready landscape trees” in inland cities identified in a study conducted by the University of California Cooperative Extension in partnership with the U.S. Forest Service.
The idea of bringing together community groups and volunteers to enhance tree canopies that cool urban heat islands --which can be more than 50 degrees hotter than...
- Author: Pamela Kan-Rice
While spring may not be the best time to plant shade trees, many people are inspired to plant trees as part of Earth Day and Arbor Day celebrations. Millions of trees are planted every year in America and many of them perish after planting, according to James Downer, University of California Cooperative Extension horticulture and plant pathology advisor.
“Tree planting campaigns, while well intentioned, may not consider all the realities of bringing young trees into landscapes and caring for them over decades,” Downer said. “Increasingly, city budgets for tree care are being cut back and planting budgets are non-existent in many cities. Tree planting...
- Author: Jeannette E. Warnert
Gardeners who follow conventional wisdom and nursery recommendations to mix organic amendments into the soil when planting new trees or perennials in their landscapes are making a mistake, according to UC Cooperative Extension environmental horticulture experts.
“This is one of the garden myths that I'm trying to dispel,” said Jim Downer, UCCE environmental horticulture advisor in Ventura County. “We recommend residents not amend the soil when they are planting based on outcomes we have observed in research.”
Downer and Ben Faber, UCCE advisor for...