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Dear Gardening Friends: 
Please note that our in-person
Winter Pruning Techniques demonstration is now full.

IN THE GARDEN
What to Do in the Garden
Seasonal Tip: Prepare Your Straw Bales
UC Master Gardeners on KSQD
Plant Spotlight: Tree Dahlias

CLASSES & EVENTS
Winter Pruning Techniques | Feb 24 (online)
Winter Pruning Techniques | Mar 12 (San Juan Bautista) - FULL

Thank you for being a part of our gardening community.

IN THE GARDEN

tangelos ripening on a branch - photo credit: UCMG joy a

What to Do in the Garden


While our gardens are drying out from early winter rains, spring bulbs are blooming, along with pests!

If you're seeing damage on seedlings, check for snails, slugs and earwigs--best to do with a flashlight in the evening to catch them! 

 
  • Gopher activity is early this year. Generally, early spring heralds gopher breeding season. It's important to trap them now, while you can catch multiple gophers in a single run. Managing the gopher population now pays dividends later in the year. Here is a link to our Integrated Pest Management presentation from last spring.
  • Spring cleaning is in order.
    • Rake leaves and twigs.
    • It's important to remove weeds in your garden before they flower and set seed so the population remains manageable. If you still have areas of wet soil, take care not to compact the area while weeding.
    • For continued weed suppression, lay down cardboard on weeded paths and cover with several inches of woodchips.
  • Local planting schedules are listed in the Resources section.
    • If you missed our seed starting class for tomatoes, peppers and eggplants from seed, the video and presentation is now listed in our class resources page.
    • If you are reusing planting containers, wash with mild soap and water to clean it. Disinfect planting containers with a 10% bleach solution, meaning 1 part bleach to 9 parts water.
    • Transplant perennial edibles such as artichokes, rhubarb and asparagus crowns.
    • Plant cool-season veggies such as greens, lettuce, brassicas (broccoli, cauliflower, cabbage) and peas.
    • In our area, you can plant beets, radishes and carrots from seed directly in beds.
    • If you are interested in potatoes, order them now and plant them by mid-March.
  • Transplant cool season annuals, like pansies, poppies, sweet peas.
  • Plant bare root fruiting vines, such as blackberries and raspberries.
  • Citrus trees should be fertilized now and then again in the spring. Here is a guide to fertilizing citrus trees. Note citrus in containers generally require less fertilization.
  • Review the deciduous fruit tree maintenance schedule listed in the Resources section.
    • It's not too late to plant bare root fruit and nut trees. Here is a fruit tree selection and planting guide from UC Santa Cruz Center for Agroecology.
    • For established trees: Now that you can see tree structure branches, dispose of any old, molded fruit above and below, which can harbor disease and pests.
    • Check out our winter pruning class for tips and techniques. Note that winter pruning encourages growth. Do not prune apricot or cherry trees in winter.
    • Watch your fruit trees for bud break. Bud break occurs when new buds begin to open. These buds may open to become leaves, flowers, or twigs. Between bud break but before they blossom, apply a final dormant oil spray. 
Evergreen Tips
  • Remove diseased plant material and discard them in your green waste can. Do not add diseased plant material to your home compost or leave them in your garden beds. Some diseases can overwinter!
  • Take a look at your irrigation system and make repairs and seasonal adjustments. 
  • If you need help determining how to deal with pests or disease, please submit a help request with photos at our gardening advice line

Seasonal Tip: Prepare Your Straw Bales

If you took our straw bale gardening class in October, we encouraged everyone to place their straw bales in the fall and let the rains start the process of conditioning them.

This is a friendly reminder that it is time to start fertilizing your straw bale to get them ready for planting. Below is a slide from that class that outlines day-by-day instructions to prepare your straw bale for planting in around 16 days. 
Here is the complete presentation from our straw bale gardening class in October. The table above is slide 17. 

UC Master Gardeners on KSQD-FM


UC Master Gardener Delise Weir was a recent guest on KSQD's In the Garden radio show, which airs Saturdays at 9 am on 90.7 FM.

Delise and host Joe Truskot discussed what to do this month in the garden in a wide-ranging conversation. Catch her interview in the 2-week archive here. 

Delise is scheduled to guest again on Saturday, February 19.
white tree dahlia flower | Photo credit: UCMG Doug Lockwood

Plant Spotlight:
Tree Dahlia (Dahlia imperialis)

 
There’s a plant among us that grows 12-15 feet tall in a single season and rewards us with white or pink flowers in November when little else is blooming. Varieties include single whites, pinks, lavenders, a double-white with a pom-pom center, and a single pink that often throws a few double flowers, all of which are attractive to bees and butterflies. It’s super easy to propagate from a stem or a tuber cutting, and pruning consists of cutting the branches down to the ground at the end of the season. 

The plant is the Tree Dahlia (Dahlia imperialis), which is native to the mountains of Mexico and Guatemala.
tree dahlia | Photo credit: UCMG Doug Lockwood
Tree dahlias spread laterally but are not invasive. This example is growing in West Santa Cruz and has become a welcome, showy addition to the owners’ yard. They prefer mildly acidic soil, need only average water, but are sensitive to frost, so sheltered spots in lower elevations in Sunset zones 4-6, 8, 9, 14-24 are optimal locations for successfully growing these plants.
Photo credit: UC MG Joy Agcongay
The Aztec name for the tree dahlia was acocotil, meaning water-cane. Early explorers and travelers used the hollow stems of the Tree Dahlia to transport water.  When you cut one of the canes, be prepared for liquid to drain out, this is completely normal.
  
The stems have nodes and in appearance are not unlike bamboo stems.  Each node will sprout. Tree dahlias can be propagated from branches or tubers in containers and then transplanted into the ground. Sections of branches can be laid directly in the ground horizontally 5-6 inches deep and covered with soil.

Gophers seem to favor tree dahlia tubers so if your garden has these pests, be sure to lay down gopher wire first. Here on the West Coast, the tubers can stay in the ground over the winter, however in areas where the ground freezes, gardeners dig up the tubers and store them until the next growing season.

A note of caution, the roots, leaves and flowers of Tree Dahlias can be mildly toxic to dogs and cats, causing skin irritation and gastrointestinal distress. 
The UC Master Gardeners of Monterey and Santa Cruz Counties has a publication on planting and care of Tree Dahlias, which can be accessed here.
 
Happy Gardening!
 
- UC Master Gardener Doug Lockwood

Resources
Tree Dahlia, Pacific Horticulture 
Tree Dahlia Propagation, including 2-minute video (Australia)

Photo Credits: UCMG Doug Lockwood and UCMG Joy Agcongay

CLASSES & EVENTS

Our classes are offered free of charge, though donations of any amount are greatly appreciated. Feel free to register for our online classes, even if you cannot attend live. All registered attendees receive a link to the online class recording along with a copy of the presentation and any handouts via email.

Winter Pruning Techniques

Part 1: Thursday, February 24, 5-6:30 pm (online)
Part 2: Saturday, March 12, 10 am-noon (San Juan Bautista State Park orchard) - FULL

Winter is the best time to prune most fruit trees, while they are dormant and their structure is easily seen.

UC Master Gardener and professional landscaper, Diane Mahan, will follow-up on her February online class to demonstrate pruning techniques at the San Juan Bautista State Park orchard. The demonstration is limited to 30 attendees. Masks are required. Registration and attendance at the February virtual class (or review of its recording) is strongly recommended prior to attending this demonstration.
Register for Pruning Techniques (online) - Feb 24

GARDENING RESOURCES

Do you have specific gardening questions? Ask a Master Gardener!
Visit our website to use online form to get Advice to Grow By!

Planting Schedules: Santa Cruz County (PDF) | Monterey County (PDF)

Class Resources
Our collection of class resources features links to our online classes, presentations and handouts, including Irrigation Basics, Backyard Composting, California Native Plant Seed Collecting, Container Gardening with Veggies and more.

Soil HealthIntroduction to Healthy Soil

Growing BerriesGrowing Berries in Your Backyard

Growing Deciduous Fruit Trees: California Backyard Orchard | Fruit Tree Maintenance Calendar for Home Orchards

Growing Citrus: California Backyard Orchard: Citrus

Growing Vegetables: California Garden Web Guide to Growing Vegetables | Plant Diseases for Vegetables and Melons

Copyright 2022 UC Master Gardeners of Monterey and Santa Cruz Counties

Our all-volunteer organization offers no-cost & low-cost research-based gardening and landscaping advice to the home gardeners in our beautiful Central Coast region. For more information on classes, resources, and advice, please visit our website.
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