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Starting From Seeds
Gregg EyestoneHorticulture AgentRiley County Office
785-537-6350
PLANTSPlace
Liquid
Air
Nutrients
Temperature
Sunlight
Direct Seeding vs Transplants
Advantages of transplants• Seeds are more economical than purchasing plants
• Grow specific plants that are not readily available
• Uniformity and consistency of the crop
• Earlier production
• Personal satisfaction
• Number of desired plants
When to Start Seeds Indoors
• Annual flowers 6-8 weeks before the last frost
• Vegetables 2-8 weeks before the last frost
• Read the seed packet
• Frost – 50% chance mid-April
• Transplant into the garden
Cool season crops – mid-March
Warm season crops - 1st weekend in May
Cool & Warm Season Veggies
• Peas
• Onions
• Lettuce
• Cabbage
• Broccoli
• Potatoes
• Beets
• Carrots
• Tomatoes
• Peppers
• Beans
• Sweet corn
• Melons
• Cucumbers
• Pumpkins
• Eggplant
Cool 50 – 70 F Warm 70 – 90 F
Seed Germination
Seed• Getting good germination of seed
is critical
• Purchase the very best seed
• The price of seed is about 5% of the total cost of growing a plant
Why Seeds Don’t Germinate?• Age – immature or old seed• Time – seeds have various time requirements• Temperature - Cool temps – pansy or larkspur
Warm temps – peppersStratification – 6 wks of temps around 30ºF
- bleeding heart, some irises• Light - Require light – impatiens, petunia, hollyhock
No light – sweet pea & bachelor buttons• Moisture• Seed Coats – scarification = nick the seed coat or soak
- morning glories & wisterias
Potting Mix
• There are many different mediums for seed germination
• Synthetic or “soilless” mixes – uniformity, freedom from disease or insect problems, and ease of use (Jiffy Mix, RediEarth, etc)
• Characteristics - light weight
- porous
- well-drained, yet retains moisture- low in fertilizer content
• Equal parts: peat, vermiculite, perlite
Containers• Various styles & sizes: - flats
- plastic cells
- peat pots
- planted “pot and all”
- Jiffy-7 – compressed peat pellets
- “Speedling” flats
- styrofoam
- plugs
• Make sure containers are clean – mild bleach solution (10 parts water; 1 part bleach)
Sowing Seeds
• Broadcast or sow in rows
• Fine seeds (petunias, begonias, lettuce) can be sown on the surface of the medium
• Large seeds should be placed in shallow depressions
• After sowing the seed, the mixture should be watered (misting is ideal). Keep flats moist
• Locate seeded flats in a warm area (70-75 degrees); –use heat tape or heat mats to increase soil temp
Sunlight
Quality (blue and red)
Quantity (to make more light on an
object, you have to either move the light
closer, or add more lights)
Duration (leave the light on)
Light Quality
Light wavelength forming a spectrum
Light wavelength forming a spectrum
Light Absorption
460 nM,
5000Kelvin730 nM, 3000K
Light Quantity (Light Energy)
Clear, sunny summer day - 10,000 ft candles
Clear winter greenhouse- 1,000 ft candles
Sheer curtain in window- 100 ft candles
Minimum for growth- 50-70 ft candles
Maximum needed for growth response is 3500 ft candle. Anything over 3500 foot candles does not result in more growth.
Light Quantity (Light Energy)
Clear winter greenhouse- 1,000 ft candles
Need to grow lettuce- 2,000 ft candles
= 2,000 Lumens
The Standard T12 lamp produces 2,650 initial lumens per lamp. The standard T8 produces 2,800 initial lumens per lamp, 6% brighter. The standard T12 lamp produces 2,300 design lumens and the T8 produces 2,660 design lumens. (brightness decreases)
Not only are you going to see a 35% reduction in energy consumption, you’ll also see a dramatic difference in light output.
Natural Light Duration
(Summer to Winter)
Morning Noon Afternoon Evening
Light Options
48-inch Florescent Bulbs
T-12 is rated at 40 watts
T-8 is rated at 32 watts
T-5 at 28 watts
LED’s advantages including durability, long life, a
cool running temperature and more latitude in
choosing specific wavelengths of light
Light Options
48-inch Florescent Bulbs
T-12 is rated at 40 watts
T-8 is rated at 32 watts
T-5 at 28 watts
Clean the bulbs, replace after so many hours
Light Options
Lighting
• Fluorescent lights (40 watt cool white) provide more uniform conditions for seedling growth
14 to 16 hours, continuously?
• LED- 22 hrs/day
• Lettuce requires light for germination
• Light will inhibit germination of seed of calendula, centaurea, phlox, statice, & vinca
Signs of Low LightPlants will become thin and spindly, produce smaller leaves, and have
a reduced aroma.
Seedlings
Seeds have germinated • Thorough watering, but less frequently
• Move to cooler location
• Sunny location or continue artificial lighting
• Thin, if necessary (pinch at soil level or move to another container.
Potential Seedling Problem
"Damping off disease“ - resembles cotton balls that have been stretched across the soil. It is a fungus that attacks the plant at the soil line.
- Damping off is best prevented by using clean seed and growing materials (pots, media).
- Do not allow the soil to remain too wet.
- Good air circulation (fan).
Fertilization
• Plants, especially those grown in soilless mixes require regular fertilization.
• 20-20-20 complete soluble fertilizer 1 oz/4 gallons applied every week
Transplanting
• Seedlings show the first true leaves (not seed leaves) they should be transplanted.
• Transplant in larger pots.
Hardening Off
• Start 7 – 10 days prior to planting in the garden.
• Increase exposure to natural light, temperature and wind.
• Continue to water and fertilize as needed.
Transplanting
• Punch a hole in the soil to reduce damage to tender roots.
• Press soil around roots and water.
• Early season crops will benefit from a starter fertilizer used at transplanting.
Direct Seeding vs Transplants
• Easy to transplant:broccoli, cabbage, lettuce, tomatoes
• Moderately easy to transplant:cauliflower, eggplant, onion, pepper
• Difficult to transplant:cucumber, melons, squash
Kansas State University Agricultural Experiment Station and Cooperative Extension Service. K-State Research and Extension is an equal
opportunity provider and employer. Issued in furtherance of Cooperative
Extension Work, Acts of May 8 and June 30, 1914, as amended. Kansas State University, County Extension Councils, Extension Districts, and
United States Department of Agriculture Cooperating, John D. Floros, Director
Gregg Eyestone,
Riley County Horticulture Agent