Robin Y. Rivet

Monthly Meeting

NEXT GENERAL MEETING: Growing Plant People - Horticulture Programs and Facilities at Southwestern College, With Holly McMullen, August 15, In-Person, Oasis, Rancho Bernardo, 1:30p -3:30p

Holly McMullen Holly McMullen is a tenured professor of plant science at Southwestern College and a field biologist with nearly a decade of experience working at the intersection of ecological research, habitat restoration, and higher education. Her expertise centers on the interactions between plants and animals, particularly within Southern California's diverse ecosystems, and she has conducted botanical and wildlife field surveys, managed large-scale restoration projects,

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Articles

TREES, PLEASE! Mighty Myrtaceae – “the myrtle family”

by Robin Y Rivet, for Let's Talk Plants! June 2026 Anna’s Hummingbird seeking nectar from a eucalyptus flower. Photo by Karney Lee, USFWS on Pixnio. Mighty Myrtaceae – “the myrtle family” The tallest flowering tree in the world is the "giant mountain ash", which belongs to the Myrtaceae family. So does the diminutive dwarf common “myrtle”, an evergreen shrub often sold at San Diego nurseries as a tidy border plant. What do they have in common? Most members are trees or shrubs

Jun 1

TREES, PLEASE! Graft Smart - Don’t Grift

By Robin Y. Rivet, for Let’s Talk Plants! April 2026. Cherry Tree Grafting Calyponte , CC BY-SA 4.0 < https://creativecommons.org/licenses/by-sa/4.0 >, via Wikimedia Commons. Graft Smart - Don’t Grift Grafting is not mysterious. Like other forms of plant propagation, success requires knowledge of biology

Apr 1

TREES, PLEASE! Are Your Trees Climate Ready?

By Robin Y. Rivet, for Let’s Talk Plants! February 2026. Photo credit: LadyCamera, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons. Are Your Trees Climate Ready? Valentine’s Day is looming, but February 2nd is Groundhog Day . Although we have ample sunshine for groundhogs to see their shadow, where are all the woodchucks? Duh. There aren’t any marmots in San Diego ( unless you count the one that hitch-hiked from NorCal in 2009 ). So how do

Feb 1

TREES, PLEASE! Urban Tree Observations: Conks, Stains, Saps And Bugs

By Robin Y. Rivet, for Let’s Talk Plants! December 2025. Turkey Tails - Trametes versicolor - fruiting body on rotting tree log. Bernard Spragg – Flickr Pro: https://www.flickr.com/photos/volvob12b/41856600312 . Urban Tree Observations: Conks, Stains, Saps and Bugs In October, I wrote about abiotic tree mishaps – especially those inflicted on urban trees by well-meaning humans. Many were preventable, so please re-read that essay if you’re a DIYer, as many of those failures

Dec 1, 2025

TREES, PLEASE! Is That Tree Really Sick?

By Robin Y. Rivet, for Let's Talk Plants! October 2025. Jacaranda tree loses its foliage before blooming in May. Nearby trees have already leafed out. "SelecTree. UFEI. " Jacaranda mimosifolia Tree Record." 1995-2025. Cal Poly State University, San Luis Obispo. Is That Tree Really Sick? “I think my tree is dying”. Sadly, this is a common lament for far too many residents. Decline of urban trees often arises from largely preventable abiotic causes. Environmentally stressed tr

Oct 1, 2025