Category Archives: Organic Gardening

FEBRUARY: Getting the Greenhouse Ready

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It’s time to get your greenhouse ready for planting! Carlotta's Little Greenhouse

Start with cleaning the shelves using 1 part bleach mixed with 9 parts water.
Read eHow for tips on cleaning a small greenhouse:
http://www.ehow.com/small-greenhouse_care.html

Sterilize your trays & pots with this same bleach solution. Purchase or make your seedling mix (which is a soil-less mix), gather your plant labels & permanent markers and you’re ready to plant.

Read how to make your own soil-less seedling mix Organic Gardening website: http://organicgardening.about./seedstartingmix.htm

To calculate greenhouse planting start dates, check each seed packet and plant according to the instructions. Count back the weeks needed for seeds to grow and when you want them really for the garden club’s plant sale or to plant in your garden after the last frost.  Seeds typically need 8-12 weeks to grow. For example: AGC’s plant sale is May 11 2013, 12 weeks back from May 11th is February 16th, 8 weeks back is March 16th . Check your seed packets for start dates.

Below is a list of flowers you can start in your greenhouse in February: Petunias, Impatiens, Lobelia, Lupine, Echinacea, Rudbeckia, Coreopsis, Salvia, Lavender, Scabies, Delphinium, Pansies, Shasta daisy, Forget-me-nots, Gaillardias, and Nasturtiums.

You can also start: Cabbage, Broccoli, Cauliflower, Brussels Sprouts, Beets, Lettuce, Cilantro and Spinach seeds. It is recommended for larger vegetable seeds, like beets, to soak them 12 to 24 hours before planting.

To begin: fill your sterilized trays with seedling mix, water the seedling mix thoroughly, and then let them sit until the next day to warm up.  On day two, plant your seeds, mark your trays/pots, then water them in.

Seeds need warmth to germinate. Check out Heirloom Seeds’ website showing seed germination/soil temperatures:
http://www.heirloomseeds.com/germination.html

You can provide warmth with heating mats (available at garden supply stores) which sit under your seed trays or you can warm your greenhouse with a portable heater.

Some seeds also need light to germinate, so place trays a few inches below a grow light or a florescent light, and keep the lights on 24 hours a day.

After the plants have developed several sets of true leaves, transplant them into sterilized pots with a good garden variety potting soil.  To avoid transplant shock water them in with a B1 solution; B1 is available at garden stores. Once plants are established in their new pots, fertilize them once a week with a 1/4-strength water-soluble fertilizer. During the rest of the time use plain water; keep the seedlings moist, but not wet. Keep plants under the lights, keep them warm and watch them grow!

By: Carlotta Lucas & Melody Jones

Finding Nutrient Values of Organic Fertilizers

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How to find the nutrient values of organic fertilizers
By Judy Scott 
Oregon State University Extension Service
CORVALLIS – Gardening resources often recommend chemical fertilizers with N-P-K (nitrogen, phosphorus, potassium) ratios, but for organic gardeners, the numbers can be frustrating. Manure and other organic materials often don’t come with N-P-K ratings, especially if purchased in bulk.Organic gardeners are in luck. Ross Penhallegon, horticulturalist with the Oregon State University Extension Service, collected information about the nitrogen, phosphorus and potassium content of many organic substances commonly used as fertilizer in Oregon, including green manure crops such as crimson clover and alfalfa.His report, “Values of Organic Fertilizers,” is online at http://bit.ly/KHXBQl.It has information on the top sources of organic fertilizers, their NPK content, release speed and effectiveness.

“Nutrient values vary greatly among organic fertilizers,” Penhallegon said. “They also vary greatly for a given organic fertilizer.” Differences include variations in the age of organic material, decomposition, application method, timing, incorporation time, and time exposed to the elements (rain, sun).

“One of the most difficult things to determine for an organic gardener is how much organic fertilizer to use, say on 1,000 square feet of garden,” Penhallegon said. “For a fertilizer with an N-P-K ratio of 12-11-2, this means 12 percent is nitrogen, 11 percent is phosphorus and 2 percent is potassium. In simple terms, this means each 100 pound bag of the fertilizer would contain 12 pounds of nitrogen, 11 pounds phosphorus and two pounds nitrogen.”

Cover crops generally release their nutrients slowly, over two to six months, Penhallegon said. Nutrient values for cover crops include: alfalfa, crimson clover, Australian winter peas and annual rye.

Blood meal, bat guano and many of the manures (variable nutrient contents) release their nutrients over two to six weeks. Burned eggshells, fish emulsion and urea (urine) are the fastest-acting organic fertilizers, lasting only a couple of weeks.

To boost the nitrogen content of your soils, apply nitrogen rich urea, feathers, blood meal, bat guano or dried blood. Manures are usually less expensive than other animal by-products. Organic amendments highest in phosphorus include rock phosphate, bone meal and colloidal phosphate. High in potassium are kelp, wood ash, granite meal and greensand.

To make soil less acidic, use materials rich in calcium, including clam shells, ground shell marl, oyster shells, wood ashes, dolomite and gypsum (all are at least 30 percent calcium carbonate or straight calcium).

Source: Ross Penhallegon, Hhorticulturalist 
Oregon State University Extension Service

Happy Soil

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Happy Soil
by Denny Morelli
(Notes from a recent talk at Medford Garden Club)

You can’t have good results in your garden if you don’t start with good soil. Top soils are made up of different components including plant and animal residue, moisture, air space and live soil dwelling organisms.

The best thing you can do for your garden is compost, compost and more compost.

Organic content provides food for growing plants, food for bacteria, fungi, earthworms and other beneficial organisms. A total organic content should be at least 6% of the top 4” – 6 “of top soil. It also provides a reservoir for moisture. Organic content also provides temperature stability and weed control.

This water reservoir prevents the tendency of over watering in the summer and the leaching out nutrients in rainy weather. Over watering can be a serious problem as it flushes out nutrients and increases pollution levels in our streams.

The timing and rate of releasing nutrients is important. Organic material helps to control the amount of fertilizer available at any given time. Air space created by the channels made by various organisms provides space for oxygen, moisture and plant roots. Do not rototill. Tilling the soil collapses this delicate structure. It is better to put a layer of 2” – 4” of compost on top early in the spring to let the nutrients sink in.

One problem in planting is that plants are usually planted too deep. Dig the hole, add some compost and plant the plant so it is higher than ground level, creating a small rounded berm. In time it will sink to the level of the ground.

Be careful where you buy compost. Most box store compost may be over a year old and have little nutrients left. Denny’s commercial formula is 40% forest material, including rotted wood, leave, moss and humus; 50% pasture material, including shredded alfalfa, grass and cover crops; 10% dairy goat & chicken manure; and nutrient supplements e.g. seed meal, kelp meal, high protein livestock feed, goat mils and trace elements. Do not use walnut leaves for mulch.

Fertilizers for home gardeners include fish emulsion, which works very fast but needs to be applied often; and Dr Earth, which takes a month to do any good. Be sure to look at the label; a lot of compost has too much magnesium. In the heat of the summer a layer of alfalfa, purchased at a feed store, protects the ground. Denny sells his compost from his farm. Read more here: http://www.ccountry.net/~compost/

Other good sources of compost are Hilton Landscape Central Point and the Grange Coop, who has an excellent compost called Green Planet Compost.

by Emilie Vest