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29 March 2012

Safe Pesticides – Safe for Whom?

There is a column making its way through my friends on Facebook declaring vinegar to be a 'safe pesticide.' I dislike the term 'safe pesticide' as it is often nothing more than an oxymoron.

The suffix of '-cide' is taken from Latin meaning 'to cut down, kill.' The more genericterms pesticide or biocide include more specific killers, like herbicide (weed killers), insecticides (specifically insect killers), fungicides and a bunch of others.

A compound doesn't get to be called a '-cide' unless it kills something, so the idea of a 'safe' pesticide is relative – 'safe' for whom? Obviously, it's not 'safe' for the thing it kills. And, in our chemical soup world, many folks seem to have become accepting that it's quite alright to eat food that is deadly for some species to eat.  But the concept of a 'safe' pesticides tugs at a conscious mind as something beyond reason.

At a recent panel discussion for gardeners in Santa Monica, I was horrified to hear an organic farmer promoting the use of nicotine as a general insecticide. His first offering was to a woman who wanted to rid her milkweed of aphids. She was growing the milkweed to promote monarch butterfly populations. As one who is called 'post-modern organic,' I was flabbergasted that she was even thinking of an insecticide at all! After all, if she's hoping to give the plant up to an insect, why would she be disturbed if a few aphids got in on the act? Her indignation towards me was very hostile as she vehemently declaring  he aphids were killing her plants. (In her defense, I was tired and hungry and when I'm tired and hungry, my diplomacy can be, um, 'challenged.')

Even rested and well-fed, call me na├»ve, but I think she's crazy. A plant that gets attacked by aphids is a weak plant to begin with - we can think of aphids as being Mother Nature's way of taking a plant out of the gene pool because it's not a good contender for passing on genetic material. So, if aphids kill her plants, I would postulate the plant was too weak to begin with. Still, why she has aphids does not beg the question as to why she wants to use a pesticide to kill them, but of course, I'm the one who thinks spraying a plant with poison so it will live long enough for human consumption is nuts.  And what kind of blinders does a person wear who can't figure why anything that kills aphids wouldn't also kill the Monarchs?  It continues to flabbergast me. 

All that aside, the final straw is that nicotine will kill EVERYTHING it touches as long as it's wet. It will kill the aphids. It will kill the Monarchs in all stages of their growth. It will kill honey bees and it will kill things in the soil if it is applied properly (pesticides are to be applied to the 'drip point' – this is standard practice and it means you spray until the solution begins to drip off the plant) and all those drippings fall into the soil and continue to kill until they are sufficiently diluted. This part of pesticide application is never talked about and we act as though it doesn't happen. But it does happen whether or not we study it.

So now to this 'safe' pesticide of vinegar. Safe? First of all, do not buy the hype. If it kills, it has a drawback, somewhere, somehow. And before I can say it's safe, I want to know what that drawback is because I don't want to have a surprise later on. Vinegar's main method of killing is by changing the pH to deadly levels for organisms - plants and or fauna depending on how it's used.  

Vinegar, just like nicotine, will kill or damage whatever it touches as long as it is still moist, still very acidic. 

I was very excited about vinegar about four years ago, using it as an herbicide on a noxious weed, False Garlic, Nothoscordum bivalve. False Garlic is a particular evil weed. The little white flowers dispense copious amounts of bubils, baby bulbs. They sprout on the surface of the soil. As the little leaves begin to reach skyward, the root springs out and begins to pull the plant under the soil. The more leaves on the surface, the deeper that bulb has been pulled under ground and, worse yet, the more baby bulbs have formed around it. When a gardener removes this plant at this stage, it might well be essential to remove close to a square foot of soil as well in order to insure none of the baby bulbs are left behind to torment you.

Nothoscordum bivalve, False Garlic
As an aside, False Garlic is obviously  a member of the Lily family by the way it looks, like onions and true garlic.  Apart from no edible bulb, the giveaway on a mature plant is that it smells like a spoiled garlic - it doesn't smell yummy.  It stinks.  

Seizing upon the lie of a 'safe' herbicide,  I elected to use vinegar on this difficult plant. I was pouring one to two cups of vinegar per plant because this species has a waxy covering which prevents the uptake of vinegar by most cells. It was necessary to get enough vinegar to percolate deep enough into the soil with enough strength to find the roots where there would be a better chance of being absorbed by the plant. I was having some success. But one day, as soon as I poured the vinegar onto a plant, two earthworms came up out of the ground writhing to their deaths in front of me. That's when I realized that the term 'safe' pesticide meant safe for me, but not for other creatures. It's also when I formulated my idea that pesticides always have unintended consequences.

It is my intention that humans begin to look at all the different '-cides' with more scrutiny. While we still do battle with perennial weeds that frustrate most of my attempts to get them gone,we have been able to achieve zero insecticide usage at The Learning Garden by having something in bloom throughout the growing season – and we often leave some of each crop to flower to help with that. Those flowers are often allowed to go to seed because we save seeds here as well. But in addition, no vegetable garden should be grown without some flowers blooming nearby. We also have several spots where we grow California Native plants to encourage more insects. 

The truth of the matter, the way to really defeat insects, is to invite more insects into the garden rather than try to kill off the ones you don’t like.

Our program to create an environment that encourages beneficial insects to make our garden their home, includes:
      1. No insecticides what so ever.
      2. Something in bloom all through the growing season.
      3. Provide water for insects.
      4. Willingness to allow plants to suffer some cosmetic damage.
      5. Willingness to let some plants die if they get overwhelmed by insects.
I urge you to consider these options and allow other creatures to co-exist peacefully in your garden - if beneficial insects make your garden their home, you will have a balance in your garden that makes it healthier for you as you avoid all forms of  '-cides' that may have harmful effects we failed to realize.

And I continue to work on getting rid of False Garlic in a more efficient manner that doesn't kill off any of  my earthworms.


24 March 2012


Offered by The Learning Garden under the auspices of the University of California Extension:
Four classes to really give you the dirt on gardening! Expand your skill level and appreciate the world of plants so much better; introducing a new series of more advanced gardening classes!
The four session class will cover the following topics:
May 20 – Crop rotation; perennial food plants; companion planting How do plants interact with one another? What should follow what? How do I care for my fruit trees? I want to grow asparagus and artichokes, but I am a little intimidated; what do I need to know?
May 27 - Seed saving/vegetable breeding Why should I be concerned about saving seeds? Is it hard to save seeds? How can I tell if it's good seed? Isn't breeding vegetables best left to the professionals?
June 3 – Propagation and grafting and budding What is grafting and why is it important? Can I really have two apples on the same tree? Is grafting 'natural' and not some biotech kind of weirdness? When can I do it?
June 10 – Vermiculture/Composting What if I don't have room for a compost pile, I just have plants in containers on my balcony? Isn't compost a lot of work? How can I really compost in a small garden?
Each class is a stand alone unit so participants may attend all four for a discounted price, or take any combination of the classes – they are designed to be modular units of instruction. These are practical classes with hands on participation in each class. Taught by Gardenmaster David King and Master Gardener Emi Carvel, these classes will hone your gardening skills to new level.
Classes are $20 each; the series of four is discounted to $75. We may have some scholarships available depending on enrollment. A minimum $20 deposit is required to hold your space. You are encouraged to dress for our often cooler days here in The Learning Garden. We will make hot tea and/or coffee on cooler days; bring your own cup as we try to edge closer to zero waste. 

Contact David for other options.

12 March 2012

Garden Master & Author David King At Santa Monica College on March 27


CONTACT:   Bruce Smith                                              FOR IMMEDIATE RELEASE
                        Public Information Officer                       DATE: March 12, 2012
                        (310) 434-4209                                


         Santa Monica College is pleased to present a free lecture, “Seeds: Local and Global,” by garden master and author David King on Tuesday, March 27 in Humanities & Social Science Lecture Hall 165 on the main campus, 1900 Pico Blvd.
         King is the founder of the Seed Library of Los Angeles and garden master of TheLearning Garden at Venice High School. An engaging and popular garden speaker, he is also a noted garden blogger and author of the forthcoming book, “Growing Food in Southern California: What to Do and When to Do It.”
         The Seed Library of Los Angeles was established to facilitate the growth of open-pollinated seeds among residents of the Los Angeles basin. The library is building a seed collection and repository, educating members about the practice of seed saving, and creating a local community of seed-saving gardeners
         King’s talk is sponsored by the SMC Global Citizenship Council, SMC Center for Environmental Studies and SMC Club Grow.
         For information, please call 310-434-3911.

The Calendar of Events At The Learning Garden