Tree San Diego

A vertical orientation color photo showing a gnarly shrub with grey and red bark reaching into the twilight sky.

Meet Arctostaphylos glauca, commonly known as Bigberry Manzanita and, since the evening of October 9, California's new OFFICIAL STATE SHRUB! YES!!! 🤩

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#Manzanita #Twilight #IntimateLandscape #SanDiego #Photography #Arctostaphylos

TSD's next Tree Treks is Saturday at La Mesita Park in La Mesa from 10 to 11:30 a.m. Join us for a guided walk where you can learn about the diverse tree species in your neighborhood, how to identify them & the role they play in creating a healthier, cooler, more climate-resilient community. #trees

Put to the test: One of the ways to check if an acorn is a good candidate for propagation is the float test. When placed in water, more viable acorns will sink. Those that float have air pockets and are likely to have been damaged by insects like weevils. Discard floaters, keep sinkers. #oaks #trees

Acorn Woodpecker (Melanerpes formicivorus): This brilliantly coloured 21cm (8.3in) woodpecker species is native to forested areas with oaks from south west USA to Colombia. Remarkable photo by Jay Spring taken in Orange, California, USA. For more of Jay's shots see: www.springphotos.net #woodpecker

Going green & thinking big: TSD kicks off "Plant-A-Thon" Friday at El Toyon Park in National City at 10 a.m. We'll plant 100 trees & aim to plant 1,000 across San Diego County over the next 10 weeks to celebrate our 11th anniversary. (Previous post had date right but day wrong; it's Friday) #trees

Catalpa Tree is TWISTED. Parthenon in the background.

There is a tree in Nashville that I'm pretty sure was pulled up into a tornado when it was a sapling, but it had strong roots and it survived. I visit it every time I'm at Centennial Park. When I first moved here, it was barely taller than me, and now it's an adult!

A trip to Pala Thursday yielded 516 viable acorns for propagation. Much thanks to Phil, one of The Oak Project’s biggest donors and supporters. The acorns were from coast live oaks (Quercus agrifolia); scrub oaks (pictured, Quercus berberidifolia); and Englemanns (Quercus engelmanni). #oaks #trees

Join Tree San Diego Saturday at Kellogg Park in La Jolla for the annual Walter Munk Day celebration. The event raises awareness of the fragility of our oceans and showcases Kumeyaay heritage and culture. Stop by TSD's table to hear about what we're doing in the community. 9:30 a.m. to 4 p.m. #trees

Kate Marianchild's "Secrets of the Oak Woodlands" examines the plants and animals that rely on this keystone species. The Oak Project's focus is restoring populations of Southern California's native oaks, preserving the woodlands' beauty and wonder for future generations. #trees #oaks

Square format black & white photo. The trunks of old oak trees form the shape of a human heart with its chambers.

"Heart of Oak" for #TreeTuesday

Coast Live Oaks trunks appear to form the shape of a human heart with its chambers. Photographed at Los Peñasquitos Canyon Preserve, San Diego, California.

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#BlackAndWhite #Trees #SanDiego #CoastLiveOak #NaturePhotography

Our goal is to plant 20,000 oak seedlings in 2026. Donations, of acorns or money, will help us meet our target. It cost roughly $1.75 to raise each seedling. Contact Jim Crouch at jbobyak2@gmail.com to give what you can and help repopulate native oaks in Southern California. #oaks #trees

Our next Tree Trek (neighborhood walk) is Saturday at 10 a.m. at Colina Del Sol Park in City Heights. Learn tree ID and local programs from certified arborists as we walk the neighborhood. #trees

Garden view of palm plants, maple tree trunk and Japanese maple red foliage, blue sky

My current view...🌱🍁🍂☀️

Tree San Diego’s first-ever Plant-A-Thon is near!
Our goal is to plant & distribute 1,000 trees in 10 weeks. We kick things off Oct. 10 in National City.
The initiative spans San Diego County, bringing trees to neighborhoods that need them the most. Details: www.treesandiego.org/plantathon #trees

This was the driest August for the Northeast (U.S.) since 1957. 🌵

This massive oak near Santa Ysabel is likely more than 100 years old. Coast live oaks (Quercus agrifolia) & Engelmann oaks (Quercus engelmannii) can live more than 250 years. The photo is by The Oak Project founder Jim Crouch, who is dedicated to bringing native oaks back to So. Cal. #trees #oaks

Fall, details later. 🍂

A yellow tiger swallowtail with black vertical strips on its wings flies over a purple thistle flower with two bees on it.

“Nope, not landing there—those bees already called dibs!” said the Tiger Swallowtail, flying past the thistle. #butterflies #pollinators #flowers #nature #EastCoastKin

Photo of a blackberry bush with ripe and unripe blackberries hanging on it.

Surprise! There's still a few blackberries!

Besides serving as habitat for scores of insect, bird and mammal species, oaks contribute to soil health and water conservation. A mature oak can drop as many as 70,000 leaves a year, adding organic nutrients to the soil. #trees #oaks

Our forests are in danger – speak out against repealing the “roadless rule”! Send a message today urging the Trump administration not to strip our forests of vital protections by repealing the Roadless Rule!

The Trump administration's proposed repeal of the "roadless rule" threatens America's national forests and the wildlife that live within them: act.defenders.org/page/87068/a... #trees

Jacaranda, black locust, London plane: Common street trees show surprising resilience to growing heat in Australia As Australian cities heat up and dry out, street trees are emerging as frontline defenders of urban livability.

Several trees, including jacarandas, which are common on the streets of San Diego, are proving resilient to increasing heat in Australia. phys.org/news/2025-06... #trees

On this day in 1916, President Woodrow Wilson signed the Organic Act, officially creating the National Park Service to protect and preserve America’s natural wonders and historic treasures “for the enjoyment of this and future generations.”

#Scotland’s large and graceful broadleaf: ash 🌳

Today, it faces a serious threat from #ash dieback, making its cultural and ecological importance more vital than ever.

Watch to explore its place in nature and myth.

Once you've found your acorns and sorted out the viable ones, it's time to get to planting. Below are more tips to help the seedlings along. #trees

Tips for propagating oaks:
Find oaks growing acorns in summer. Start picking in fall as soon as a gentle twist removes the acorn from its cap.
Don’t collect from the ground.
Put the acorns in water for a float test. Healthy ones will sink. Discard the floaters.
More tips tomorrow.
#oaks #trees

A picture of a group of pine trees.

Trees communicate with each other. Everything is connected. Everything.

A beautiful, big (70 feet tall) western sycamore in Escondido's Kit Carson Park. Sycamores are native to California. In nature, they are usually found near rivers and streams. #trees

Europe scorched by wildfires – pictures from space Satellite imagery shows the impact on Europe after wildfires raged across the south of the continent

Europe scorched by 2025 climate wildfires.

The wildfires of 2028/2029 will be much worse and far more extreme, because of politicians that keep allowing fossil fuels to be burned.