Wood Ashes / Sustainable Gardening

image via commons.wikimedia.org

One of these days I need to get the soil tested.  I could not identify a WA State agency that tests soil.  On a WSA website there is a list of private companies that test soil, but it was so complicated I gave up.


Meanwhile, I don't want to waste potential soil nutrients.  I think compost is generally well balanced, if it comes from kitchen and garden waste.  The raised beds contain a mixture of local soil - mole hills I collect from the 2 acres of lawn, finely ground by the little animals - and commercial compost by the truckload. Somewhere around 1/2 to 1/3 commercial compost.  The lower part of the raised beds is inverted sod, obtained from planting trees and shrubs around the yard; and weeds or rotting straw mulch.  I let the worms and fungi compost that in situ.

Meanwhile, on weekends we heat the house using a wood stove.  In general terms, the resultant ash consists of most of the nutrients a plant needs to make wood, at least, in concentrated form.  Oregon State University Extension site states wood ashes contain the 13 most needed minerals.  Nitrogen and sulfur are lost as gases.  With acid rain, sulfur is not usually in short supply but could be supplemented using epson salts.  Nitrogen could be supplemented using fish emulsion or, if the situation permits, fresh urine, 10:1 dilution in water. This last - saves on groundwater waste (flushing) - from this website, "Many toilets use between 50 and 100 litres of water a day to flush approximately 1.5 litres of pee. The average person has five wees a day and the average flush uses eight litres of water - that's 40 litres.".  I understand that last may be off-putting, but that's water I can use in the summer for watering vegetables trees fruits flowers shrubs; saves on groundwater and reduces salination of the drainage field and nitrogenous pollution of groundwater.

According to the OSU site, " The fertilizer value of wood ash depends on the type of wood. According to Sullivan, hardwoods produce about three times the ash and five times the nutrients per cord as softwoods. A cord of oak provides enough potassium for a garden 60 by 70 feet. A cord of Douglas fir ash supplies enough potassium for a garden 30 by 30 feet."  Areas to consider ash include  "As a general rule, acid soils that would benefit from ash application are usually found in those places in Oregon that get more than 20 inches of rain per year.  I could add to that, the effect of watering the raised beds through the summer, would also leach soluble nutrients, and nutrients are lost from the soil via vegetable harvests and plant materials that are removed.  Those plant material nutrients do get returned to the garden as compost.

According to the Ed Hume website,  Phosphorus content usually ranges between 0.8% - 3%, potassium from 2.8% - 8.6%, calcium from 14%-28%, magnesium from 0.8%-2.8% and sulfur from 0.3%-0.5%.  I imagine softwood ashes are at the low end of that, so N:P:K roughly 0:1:3 or something like that, with additional Ca and Mg.  I was thinking about adding Mg via Epsom Salts but with the firewood ash, that would not appear needed.  The Purdue website states trace minerals include " micro-nutrients such as iron, manganese, boron, copper and zinc. Trace amounts of heavy metals such as lead, cadmium, nickel and chromium also may be present."  I figure the bad ones, if present in cordwood, are everywhere else as well, so are not a concern for me.

I really should get the soil tested.  I may try this site.  Or this one - maybe better.

They also comment that " One-half to one pound of wood ash per year is recommended for each shrub and rose bush"

We use locally available wood, which is mostly softwood.  I doubt that we go through 1/4 cord in a winter.  The 30 X 30 ft calculation is 900 sq feet  My raised beds when completed will be approx. 12 X 4 X 8 = 384 sq feet.  The rest of the 2 acres is orchard, grass, and bushes and trees.    So for the raised beds, roughly 1/3 of the winter's ashes could go on the beds, with the remainder spread around the wider area of the orchard and grass/trees/shrubs.

In practice, I can't calculate it closer.  What I'm doing now is spreading a weekend's ashes on each unused raised bed, once for the winter.  The woodstove season extends more than 12 weekends, so I think that's safe.  The rest is scattered in a different area of orchard, or around bushes and trees, a fine dusting, each weekend.  Not around acid loving plants like conifers, blueberries, rhododendrons, camelias; or around potatoes.  I like that the atoms from trees, burned in the fireplace, can become atoms it the trees I'm growing.

Random thoughts, on a chilly rainy late fall morning.

Inchelium Garlic. Coffee grounds. Blog Maintenance.

The Inchelium garlic is at about the same stage as garlic plants last year. This variety is a Northwest native american heirloom. I had also planted German Red, which did very well last year. Most of the garlic that we have eaten for past few months has been from the garden, and we eat several heads of garlic per week.

Last night, I stopped by Starbucks & picked up 2 bags of coffee grounds for the tomato bed. The barrista asked if I wanted the garbage bag full too, so I got even more than hoped for. Somehow I feel embarrased to ask for them, but if not used, they would add to landfill waste, with a rich, organic soil enhancing material that is then lost to the environment, meanwhile soil amendments need to be bought to enhance the soil. I'm less and less enthusiastic about the packaged manures, since those animals are fed antibiotics, worsening the antibiotic-resistant bacteria situation. Coffee grounds are a great plant food. I usually scatter the coffee grounds across the surface of the soil, and dig them in. Some also go into the compost. The earthworms love them. Despite what a number of sites claim, they are not acidic - the acid goes onto the coffee, which we drink - the grounds are neutral. I figure that I've added a few hundred poiunds of coffee grounds to the "growing greener" yard over the past few years.

Labels are now added to the postings. it's fun to click on them & have all of the postings on a subject pop up on one web page. But, for some reason, the process of posting photos is more cumbersome since I updated to the new blogger. Win some, lose some.

More therapy. The last tomatoes. Crazy leaf guy (me). Last ginkgo leaf.

That crazy leaf guy (me). While walking Charlie & Baigo, I passed a lady packaging up her leaves. I asked if I could have them. Here they are. I spent a couple of hours spreading them on the driveway, running over them with the lawn mower, then spreading the chopped leaves on the borders. The mower works better than the chipper shredder, but either way it's hard work.

A few tomatoes still ripening in the window. Ning made a stir fry using green tomatoes. Good.


One final leaf on the ginkgo tree. Ning doesnt know it yet but I collected a quart container full of ginkgo fruits (from a tree in an East Mill Plain park) to clean for seeds. I dont know if I'll plant them or eat them.

Small things add up: Coffee grounds for the garden.

For the past 3 years, I've been collecting coffee grounds from work, home, and occasionally from Starbucks. Sometimes I add them directly to the soil (as in Winter or Spring when I'm digging around in the garden), sometimes to the worm bin, and sometimes to the compost pile.

Some simple calculations:
I buy a 5 pound bag of coffee beans about once monthly (for my use only). 5 pounds X 12 months = 60 pounds (dry weight) per year.

At work, I collect the grounds from my small section of the office, also for the compost pile or garden. That's about 1/2 pound daily (wet) for 4 days per week, or 2 pounds per day. So, about 100 pounds per year.

COffee grounds make for good compost or soil amendment. They are similar in soil nutritional value to manures, but without the salt and antibiotics that go into animal agriculture.

There are about 298 million people in the United States. Per capita coffee consumption is 4.4 kg (9.68 pounds) per year. 298 million X 9.68 pounds / 2000#/ton = 1.4 million tons per year.

So, from that little cup of coffee per person, a couple of cups daily, it starts to add up.

I'm sure that there are better calculations, from more accurate data out there, but the bottom line is, it's still "a lot". Collecting coffee grounds for the garden is good for the soil, and good for the environment.