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UC Master Gardener Program Napa County
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Spring & Summer Vegetables Workshop
March 11, 2017
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Today’s MG Team
• Cindy Pitcher
• Susanne von Rosenberg
• Mike Quinn
• Cindy Panek
• John Pearson
• Jennifer Loebs, Greater
• Priscilla Wrubel, Cashier 2
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Who Are Master Gardeners?
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UC trained volunteers providing research based horticultural information for Napa County residents
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Services Provided
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➢ Help Desks: --Office M-W-F 9am—Noon --Nurseries and box stores in April & May--Farmer Markets
➢ Public Workshops
➢ Public Speakers
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One of the handouts
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Here’s What We Will Cover
• Preparing Your Garden
• Prevention & Maintaince
• Demonstrations
• Planting Seeds & Transplanting Seedlings
• Resources for More Information6
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So many veggies—so
hard to choose
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Warm Season Crops
• Grow best 65 to 95 Degrees
• Are injured or killed by frost
• Grow best 55 to 75 Degrees
• Tolerate some amount of short-term freezing (frost tolerant)
Cool Season Crops
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• Location
• Irrigation
• Soil (vs Dirt)
• What & When to Plant
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Why Does Location Matter?
• Climate Zones & Micro-Climates
• Sunlight—how much needed daily
• Temperature
• Terrain
• Wind
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CLIMATE
• Requires an understanding of our climate, Napa Valley climate zones, and site microclimates
• Requires observation and planning
• Gardening in harmony with our environment requires less effort
• Understand that climate zones and microclimates vary throughout the county—and around your property
Most important factor in successful home gardening
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Our Mediterranean Climate
• On west coasts of continental land masses,
• Next to sea,
• Influenced by subtropical high-pressure systems
that inhibit summer rainfall.
12•Only 2% of world shares this climate
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Napa Area Climate Zones--Sunset Magazine
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7-Lake Berryessa
15-Foothills
14- Napa Valley
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Growing Season: Mid-March—Mid November
Zone 15 Coastal CoolGrowing Season: May-November
Fog-catching hilltops, Mt. Veeder, Spring Mt., Howell Mt
Zone 7 Foothill - Digger Pine
Growing season May to mid-OctoberPope Valley, Lake Berryessa
Napa Valley Floor
Napa Area Climate Zones--Sunset Magazine
Zone 14 Coastal Warm
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SUNLIGHT 6-8 Hours DailyWest
South
East
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West
East
South
North
Dry & HotMoist
Sunny
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What is a Microclimate?
A climatic condition specific to a small area that is different from its surrounding conditions
Where can they occur?
Just about anywhere.
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Microclimates Within A Garden
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Good Location?
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Preparation
Terrain: Level Ground: Easier to prepare, plant and irrigate.
Easy Access
Water Supply – Locate nearby
Windbreaks—as needed
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Preparation:Irrigation
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• Plan ahead how to irrigate:
• Drip system?
• Hand Water?
• Overhead sprinklers?
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Overhead Sprinklers?
Low labor time, BUT need to water a long time to get deep into roots; water loss to evaporation
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Hand Water?
Labor intensive; Unlikely to get to roots. Need to get down to base of plant. Water evaporation
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Make a berm to hand water—
Use a hose bubbler
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Here’s the Right Way!
Get to the root of the issue
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DRIP System By Zones
Best to Install drip systems with emitters before planting seedlings
Vacuum Breaker
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Summer Veggies
➢Terminology
➢ What, When, Where, & How
➢ Seedlings vs Seeds
➢Starting Indoors
➢Transplanting
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Terminology
l ➢ Soil
➢ Soil Texture
➢ Amendments
➢ Mulch
➢Compost
➢Fertilizer
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Essential Plant Nutrients➢ C, H, O
➢ PRIMARY: N, P, K
➢ Secondary: Ca, Mg, S
➢ Micro: B, Cl, Cu, Fe, Mn, Mo, Ni, Zn
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Planting➢ What?
➢When? Season, Frost
➢ Where? Outside, Indoors
➢ How? Preparations/supplies
➢ Seedlings vs Seeds
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Selecting seedlingsInspect in pots and 6-packs
Taller is not best—especially if already blooming.
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Starting Indoors➢ Seeds: Small vs Large
➢ Kits
➢ Soils
➢ Grow Light
➢ Watering
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Heating Pad (Optional)
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Seedling Mishaps
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Hardening & Support
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Into the Garden
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Enjoy!
“AfternoonHarvest”
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Demonstrations—Seed Planting—Seedling Transplanting
Demonstrations• Window Planters
• DIY Seed Tape
• DIY Newspaper pots
Hands-On (You…not us)
• Planting Seeds in 6-packs
• Transplanting Seedlings
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Management and Prevention
• Fertilizer
• Irrigation – Timing
–Quantity
• Mulch
• Threats
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FERTILIZER
• Vegetable gardens are unnaturalsystems
• Regular fertilizer application required
–Before planting
–Possibly during growth period
• Organic preferred
• Follow package directions
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RAIN
More Rain Coming? Can’t count on it… Plan your garden and watering methods accordinglyPlant Now?Maybe…wait till soil is workable
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Water Needs Depend on Many Factors
• Soil Type (sandy, clay, loam) and organic content/mulch
• Weather (sun, temperature, humidity, wind)
• Time of year (day length)• Type of vegetable• Growth cycle of the plant
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When to Water
Test: Water if dry at 2-3 inches
Monitor Regularly
NOTE: Drooping leaves do NOT always mean you need to water. Check the soil. Avoid overwatering. Roots can drown.
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RELATIVE WATER NEEDS BY TIME OF YEAR
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MULCH
• Benefits–Weed control
–Reduced water use
–Keeps soil cooler (up to 30°F)
–Protect and improve soil structure
• Common types: compost, tree trimmings, shredded leaves, shredded newspaper
• Renew organic mulches regularly
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THREATS
• Diseases• Invertebrate pests (AKA bugs and
slugs)• Vertebrate pests• Frost/Cold Temperatures• Weeds
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Integrated Pest Management
• Prevention• Diagnose First!
• Cultivation or pest/disease?
• Non-chemical control
• Limit use of pesticides (least toxic first)
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What Happened Here?
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What Happened Here?
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What Happened Here?
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Prevention
• Healthy soil• Healthy plant • Right plant in the right place• Proper care: water, fertilizer, light,
temperature• Sanitation/crop rotation
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Addressing Diseases
• Proper cultivation
• Resistant varieties
• Cut out affected parts if isolated issue (and not soil-borne)
• “Shovel-prune”
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Wilt on Tomato
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Powdery Mildew
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Insect Pests• Know your “good guys”
• Tolerate some damage
• Wait for beneficials
• Non-chemical controls first
• Barriers/exclusion
• Water Sprays (aphids)
• Physical removal – multiple options
• Pheromone traps
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Insect Pests
• Pesticides are a last resort
• Least toxic first (e.g., soap spray, iron phosphate for snails and slugs, Bt)
• Apply pesticides in accordance with manufacturer’s specifications
• Prevent overspray/run-off
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GOOD OR BAD?
Lady Beetle Cucumber Beetle
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GOOD OR BAD?Earwig Sow Bug and Pill Bug
(“Roly-Poly”)
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Vertebrate Pests• Types of pests:
• Deer• Gophers, moles, voles, ground squirrels• Squirrels• Raccoons, opossums• Rabbits• Birds
• Two primary options for control:• Barriers/Exclusion• Killing (as allowed)
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Frost and Cold Temperatures
• Plant summer veggies when soil AND nights are warm
• Cold temps slow plant growth and reduce nutrient absorption
• Many options for frost protection
– Frost protection cloth
– Plastic jugs
– Wall-o-water
– Newspaper, sheets, plastic sheeting64
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Frost and Cold Temperatures
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What About Weeds?• What is a weed?
• “A plant growing in a place that you don’t want it to.”
• Weeds can compete with desired plants
• Prevention• Mulch• Prevent re-seeding• Don’t bring home weeds
• Collateral Damage
• Reuse: Mulch, home-compost, or yard waste
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BAD BUGSThrips Leafminers
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BAD BUGSSquash Bugs Harlequin Bugs
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BAD BUGS
Cabbage Loopers
Corn Earworm
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Tomato Hornworm
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GOOD BUGSParasitic Wasps
Lace Wing
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GOOD BUGS
Soldier Beetle Hoverfly
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GOOD BUGS – SOME OTHERS
• Praying Mantis
• Ground Beetles
• Braconid Wasps
• Tachinid Flies
• Predatory Mites
• Aphid Midges
• Damsel Bugs
• Minute Pirate Bugs
• Mealybug Destroyer
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Rust on Beans, Corn Smut
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Accessing Online Resources:--Napa Master Gardeners --UC California Garden Web
Search: “Napa Master Gardeners”
Or: http://ucanr.edu/sites/ucmgnapa/
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See Handout for Detailed Instructions
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Thanks!
Be sure to complete the
evaluations before leaving
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