This invasive plant is toxic to horses; find out ways to control it
This spiky weed, the yellow starthistle, is invasive across California, and very dangerous to horses. Photo by Eugene Zelenko, courtesy of Wikimedia Commons
It’s prickly, invasive and can kill a horse. Those are just a few reasons yellow starthistle is considered such a bad weed.
Right now, this noxious plant is getting ready for another attack on California. A winter-growing annual, starthistle produces seed in September and October that sprouts with fall rain. Found in every county, starthistle is estimated to be the dominant plant across 15 million acres in California alone.
With deep taproots, starthistle seems impervious to many attempts at control. Yes, it does support pollinators (and makes delicious honey), but starthistle is toxic to horses – which makes it downright dangerous in pastures.
Learn ways to control starthistle -- before it’s too late -- in a free workshop, offered by the El Dorado County master gardeners.
Set for 9 a.m. to noon Saturday, Oct. 26, “Starthistle Management” will take a deep dive into this thorny subject with loads of practical information. The in-person class will be held at the Bethel-Delfino Ag Building in Placerville.
“Join Master Gardener Steve Savage to learn about this invasive weed that has taken over large portions of California’s range land and urban landscape,” say the master gardeners. “Learn about its origins, how it moves, why it is so difficult to control, how to overcome these difficulties, control methods, and how to design an effective control program.”
Native to the Mediterranean, yellow starthistle likely came to California (and the greater Sacramento area) in contaminated animal feed during the Gold Rush, say UC researchers. This weed loved the climate and quickly became a nuisance. It thrives where other plants struggle, such as compacted dirt along roadways.
No advance registration for the workshop is needed, although it is appreciated, say the master gardeners; space is limited. The Bethel-Delfino Ag Building is located at 311 Fair Lane, Placerville.
More details and registration link: https://mgeldorado.ucanr.edu/
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Flowers in My Back Yard Series
March 3: Fruit tree blossoms are a fleeting joy
Feb. 27: Are your roses looking rusty?
Feb. 24: Treasure spring daffodils now and for years to come
Feb. 17: How and why to grow wildflowers
Feb. 10: Let's talk Valentine's Day roses
Feb. 3: Why grow flowers?
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Garden checklist for week of March 8
During this sunny week, get your garden set up for a beautiful spring:
* Fertilize roses, annual flowers and berries as spring growth begins to appear.
* Pull weeds now! Don’t let them get started. Take a hoe and whack them as soon as they sprout.
* Prepare vegetable beds. Spade in compost and other amendments.
* Prune and fertilize spring-flowering shrubs after bloom.
* Feed camellias at the end of their bloom cycle. Pick up browned and fallen flowers to help corral blossom blight.
* Feed citrus trees, which are now in bloom and setting fruit. To prevent sunburn and borer problems on young trees, paint the exposed portion of the trunk with diluted white latex (water-based) interior paint. Dilute the paint with an equal amount of cold water before application.
* Feed roses with a balanced fertilizer (such as 10-10-10, the ratio of nitrogen, phosphorus and potassium available in that product).
* Prune and fertilize spring-flowering shrubs and trees after they bloom. Try using well-composted manure, spread 1-inch thick under the tree. This serves as both fertilizer and mulch, retaining moisture while cutting down on weeds.
* Cut back and fertilize perennial herbs to encourage new growth.
* In the vegetable garden, transplant lettuce and cole family plants, such as broccoli, collards and kale.
* Seed chard and beets directly into the ground. (Soak beet seeds first for better germination.)
* Plant summer bulbs, including gladiolus, tuberous begonias and callas. Also plant dahlia tubers.
* Shop for perennials. Many varieties are available in local nurseries and at plant events. They can be transplanted now while the weather remains relatively cool.
* Seed and renovate the lawn (if you still have one). Feed cool-season grasses such as bent, blue, rye and fescue with a slow-release fertilizer. Check the irrigation system and perform maintenance. Make sure sprinkler heads are turned toward the lawn, not the sidewalk.
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Send us a gardening question, a post suggestion or information about an upcoming event. sacdigsgardening@gmail.com
Food in My Back Yard (FIMBY) Series
Lessons learned during a year of edible gardening
WINTER
Is edible gardening possible indoors?
Hints for choosing tomato seeds
Why winter is the perfect time to plant fruit trees
When to plant? Consider staggering your transplants
How to squeeze more food into less space
Plant a fruit tree now -- for later
Win the weed war by tackling them in winter
Tips for planting bare-root trees, shrubs and vegetables
Time to give vegetable seedlings some more space
Ways to win the fight against weeds
FALL
Dec. 16: Add asparagus to your edible garden
Dec. 9: Soggy soil and what to do about it
Dec. 2: Plant artichokes now; enjoy for years to come
Nov. 25: It's late November, and your peach tree needs spraying
Nov. 18: What to do with all those fallen leaves?
Nov. 11: Prepare now for colder weather in the edible garden
Nov. 4: Plant a pea patch for you and your garden
Oct. 27: As citrus season begins, advice for backyard growers
Oct. 20: Change is in the autumn air
Oct. 13: We don't talk (enough) about beets
Oct. 6: Fava beans do double duty
Sept. 30: Seeds or transplants for cool-season veggies?
Sept. 23: How to prolong the fall tomato harvest
SUMMER
Sept. 16: Time to shut it down?
Sept. 9: How to get the most out of your pumpkin patch
Sept. 2: Summer-to-fall transition time for evaluation, planning
Aug. 26: To pick or not to pick those tomatoes?
Aug. 19: Put worms to work for you
Aug. 12: Grow food while saving water
Aug. 5: Enhance your food with edible flowers
July 29: Why won't my tomatoes turn red?
July 22: A squash plant has mosaic virus, and it's not pretty
July 15: Does this plant need water?
July 8: Tear out that sad plant or baby it? Midsummer decisions
July 1: How to grow summer salad greens
June 24: Weird stuff that's perfectly normal
SPRING
June 17: Help pollinators help your garden
June 10: Battling early-season tomato pests
June 3: Make your own compost
May 27: Where are the bees when you need them?
May 20: How to help tomatoes thrive on hot days
May 13: Your plants can tell you more than any calendar can
May 6: Maintain soil moisture with mulch for garden success
April 29: What's (already) wrong with my tomato plants?
April 22: Should you stock up on fertilizer? (Yes!)
April 15: Grow culinary herbs in containers
April 8: When to plant summer vegetables
April 1: Don't be fooled by these garden myths
March 25: Fertilizer tips: How to 'feed' your vegetables for healthy growth