Straw Bale Garden Tour Part II

In this video we take a tour of our straw bale garden as it appears this week. The vegetables varieties you see growing are Tromboncino squash, Lunga di Napoli squash (growing up into a native bush), Matt’s Wild Cherry tomato, Celebrity tomato, eggplant and Swiss chard. And just to take down my smugness a notch I also included a shot of an unsuccessful cucumber plant. Other than the cucumber, though, this is one of the most productive vegetable gardens I’ve ever planted. I’m now a big fan of the straw bale method.

The music is by Karaoke Mouse–“Shanghai Reggae.”

How To Stop Powdery Mildew

powdery mildew

My winter squash has what Mud Baron once described as “jock itch for plants:” powdery mildew. I’ve tried all kinds of notions and potions in the past, but this year I decided to see what the science says about powdery mildew. Our climate where I live in Los Angeles is, unfortunately, ideal for producing this vexing fungus.

IPM
Let’s begin with some condensed advice from UC Davis’ Integrated Pest Management page:

Preventative measures:

  • grow resistant varieties
  • find a sunnier spot for the vegetable garden
  • back off on nitrogen

Non-chemical approaches

  • sprinkle plants with water mid morning–add soap for more effectiveness
  • remove infected leaves promptly and dispose of them

Fungicides:

  • apply horticultural oil, neem oil or jojoba oil if the temperature is under 90° F. Do not apply any of these oils if you have used sulfur.

DIY Options
For home remedies I turned to advice from Washington State University horticulturalist Linda Chalker-Scott.

How about milk, widely touted as a powdery mildew treatment? According to Chalker-Scott the answer is yes it might work, but you may need to apply milk before powdery mildew appears. And the studies were done with whole milk, so the effectiveness of other kinds of milk have not been tested. Milk has not worked for me in the past, probably because I applied it too late.

How about baking soda? Chalker-Scott is skeptical. Baking soda has never worked for me.

Compost tea? I hate to bring it up as the topic is insanely controversial. I discovered a tempest in a compost tea pot when I tried to write a non-partisan magazine article about it. Let’s just say I ended up leaning towards the skeptical side when I looked at the evidence. Let me know if you think I’m wrong on this, especially if you can leave a link to a peer reviewed study.

Conclusions
What has definitely worked for me in the past is seeking out resistant varieties. I wasn’t smart enough to remember this fact so I’m going to try the soapy water approach and step up to something stronger if I have to. Part of my problem might also be too much nitrogen–my infected squash is in our straw bale garden and I had to apply a lot of blood meal to get it going. More sun would also help but that would involve cutting down a very large tree. I’ll update this post later in the season.

Let’s hear from you . . .
What powdery mildew treatment have you tried and how did it work? Leave a comment and join the conversation!

And I put the question out on the Root Simple twitter feed and got a few divergent opinions:

Christopher Kennedy ‏@ckpfunk Bonide’s Copper Fungicide for organic gardening. I spray every 14 days this time of year instead of every other w/ baking soda.

Alec ‏@Alec I’ve tried horsetail tea, sea-crop, baking soda, compost tea, and neem oil on mildew, but none compare to milk.

Alissa Walker ‏@gelatobaby I just sprayed with a baking soda solution seems to have done the trick so far. And removed all damaged leaves.

Alex Mitchell ‏@alexmitchelleg give the plants some air, water the ground not the leaves. Could spray diluted milk with water on leaves – never worked for me

Straw Bale Garden Update: Success!

straw bale garden

Ladies and gentleman, straw bale gardening works. I left town for a week earlier this month and, during my absence, the vegetables in the straw bale garden exploded in size. The Tromboncino squash on the left, is threatening to envelop the entire yard.  The tomatoes are equally vigorous and covered in ripening fruit.

straw bale garden zucchini

Zucchini is on the menu.

While it takes an input of outside resources in the form of straw and fertilizer, straw bale gardening is a great solution for beginning gardeners or for those cursed with bad soil. And the skunks that have decimated my previous vegetable gardens are unable to get up on the bales.

I’m considering trying another straw bale garden during our winter season. And I’m also pondering building boxes to put the bales in to make the garden look a bit neater.

Compare the straw bale garden to the depleted raised beds in our front yard:

depleted vegetable bed

I’ve talked to a lot of people about straw bale gardens since we started ours. Some things I’ve heard from other gardeners:

  • Some straw bales may be contaminated with herbicides. Do a bioassay before planting. Here’s some instructions (scroll down to the end of the article).
  • One gardener I met did not know that the bales need to be prepared by adding nitrogen–you can’t just plant straight in the bales.
  • Once the bales have been prepared you need to add fertilizer periodically. I’ve been adding fish emulsion every two weeks.

How is your straw bale garden?

And thanks again to Michael Tortorello whose article “Grasping at Straw” inspired us to try straw bale gardening.

Annie’s Annuals and Perennials

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The artist Sandow Birk once did a show depicting a fictitious war between Northern and Southern California. If that war were to be fought by plant nurseries, the forces of Northern California would have us, down here in the Southland, badly beat. There’s a few good native plant nurseries here, but that’s about it. There’s nothing quite as spectacular as Annie’s Annuals and Perennials, located in Richmond on the eastern side of the San Francisco Bay.

Entrance display. Photo: Annie's Annuals and Perennials.

Entrance display at Annie’s. Photo: Annie’s Annuals and Perennials.

Annie’s was one of the stops on the Garden Blogger’s Fling, where we got to hear Annie Hayes herself talk about her business. She noted that most retail nurseries get their stock from distant, centralized wholesale nurseries. An outbreak of late blight disease in tomatoes back in 2009 demonstrates that centralized nurseries are a great way to spread plant diseases over wide areas.

Annie’s specializes in riotous color. Many of the spectacular gardens we visited on the Fling sourced their plants from Annie’s. And in addition to unusual and rare ornamental plants, Annie’s has a great selection of edibles. It’s first time I’ve ever seen Oca (Oxalis tuberosa) outside of a book.

I had to keep a tight grip on my credit card to prevent myself from buying plants I had no way of getting home on my bike. The good news is that Annie’s does mail order. And she’s got a bunch of tutorial videos covering topics such as container planting and plant combinations. As we begin version 4.0 of our back yard garden, I have a feeling we’ll be ordering plants from Annie’s.

Disclosure: we’re always happy to write about businesses we like and support. We did not get any compensation or free items from Annie’s.