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Rubbing salt into wounds

Last week I posted about some horticultural disasters I witnessed in the Czech Republic. This week the chamber of horrors is little closer to home; virtually in my back yard to be specific. Our property backs up to US 127, the main North-South through route in our area. It’s a limited access highway with a posted speed of 70 mph, which means an average speed of 82.7 mph. It also means the road is regularly salted whenever it snows during the winter. As a result, some plants along the highway really take a beating, sometimes with some interesting results.

On Friday I received an email from Susan Gruber, our Undergraduate Advisor, who also commutes on US 127. “Hey Bert, Have you seen the pear trees on the east side of NB 127 just south of the Round Lake Road (and Price Rd) exits? Street side fried, shows up great with flowers on the other side. Also same trees planted at the same time doing great by the ramps, farther from the road, slower traffic, some up on the berms etc. Make great GP fodder, but I didn’t have a decent camera or the guts to pull over and do phone photos in rush hour.”

Unaffected pears upslope and away from salt exposure

Indeed I had seen the trees. As Susan noted, the sides of the trees facing the highway were fried, the opposite sides were in full bloom. I got a few photos over the weekend but the effect was a little less striking than earlier in the week when the trees had blooms but hadn’t begun the leaf out.

Pear trees in the line of fire

The planting illustrates a classic example of wrong tree-wrong place. Interestingly there are several crabapples that were installed as part of the same planting project that seem to be doing well. Selecting trees for exposure to deicing salt is a dicey proposition since, like this example, most of our information is anecdotal. Where the effects of deicing salt on plants have been systematically examined, the studies may focus on only soil exposure or only aerial deposition; whereas trees in the real world get it with both barrels.

Eastern white pine after one winter at a rest area along I-96 east of Lansing. An ideal proving ground for salt tolerant plants.

Ironically a colleague of mine in our department and I put together a proposal several years ago for our state Department of Transportation (MDOT) to identify salt tolerant plants for roadside plantings. Our plan was to install a series of replicated plantings of perennials (trees, shrubs, herbaceous perennials) at highway rest areas throughout the state. We would then correlate plant performance with degree salt exposure and identify plants that could survive, grow and maintain their aesthetic value under the highest salt loads. Initial discussions were positive until the proposal worked its way up the chain of command. Finally it was determined – I am not making this up – that MDOT could not participate in a project on indentifying plants that were tolerant of deicing salts because that means they would have to admit that salt was causing a problem. OK; just don’t tell the trees on US 127…

In our studies we rate plants on a scale of 1 (alive) to 5 (dead). These are class 4 (wish they were dead…)

My Thoughts on 14 Foods…

Yesterday on Facebook I posted a link to a list put out by the Rodale Institute which takes a look at 14 things that you should never eat. Some I thought were reasonable, and some I thought were a little nuts. All in all though, it was an entertaining experience that made me think.

Here are my thoughts on the 14 foods. Please feel free to disagree, and also realize that, while I am relatively familiar with the production of fruits, vegetables, and, to a lesser extent, staple crops like wheat, I’m not nearly as knowledgeable about meat and fish, and I’m certainly not a dietician. So for most of these, you should take my opinions with a grain of salt.

Swordfish – I agree with Rodale simply because of overfishing concerns. I am also concerned about the presence of heavy metals, but I do wonder how often someone would need to eat swordfish (and how much they would need to eat) to really endanger themselves?

Nonorganic strawberries – Well yes, strawberries are sprayed a lot, and if they’re grown organically they’re often sprayed a lot too – just with different things. I certainly think it’s a good idea to wash anything that you buy from the store – no matter how it’s grown – with warm water before eating it, but I don’t see avoiding conventionally grown strawberries as substantially reducing risk – organic strawberries have their own set of risks (possible contamination and use of organic pesticides). I do see a reason to buy locally grown strawberries – flavor!.

Diet Soda – I agree, because Diet Soda tastes like….well, I shouldn’t say it here.

McDonalds – I agree, not because of the GMO concerns, but instead because I’m opposed to the way that animals are treated in factory farms. That said, I love my Big Macs way too much to give them up (Don’t bother calling me a hypocrite — I’ll just agree with you).

Canned tomatoes – I kinda-sorta agree, but mostly because I like fresh tomatoes, or tomatoes from a glass bottle. I am somewhat concerned about BPA and would like to see more studies done on it, but I do not think that the danger is nearly as clear-cut as presented in this article. My family and I really don’t eat that much canned produce simply because we’re not all that thrilled by how it tastes.

Bread – I don’t agree. Certainly some people can have reactions to certain things in bread (like gluten) but the idea that modern wheat is some kind of lurking poison is a bit over the top.

Industrially produced hamburgers – Define industrially produced and I’ll tell you my opinion. Then tell me exactly how I tell if a burger is industrially produced. If it means I need to give up Five Guys….

Corn – I don’t agree, but I do love this line from the beginning of the article “Today’s corn plants are more like little pesticide factories with roots.” It conjures a cool dystopian image in my head. Look, every plant produces chemicals to defend itself from predators. It’s true, we gave corn a new one by using genetic engineering, and now we’re able to grow corn by using fewer insecticides, almost all of which are much more potentially damaging to us and the environment than the Bt we’ve put into corn.

White chocolate – Umm – I don’t know what to say about this one. I like it and I don’t see anything in the write up that convinces me it’s bad.

Artificial Sweeteners – I agree. I can’t stand the flavor and I’ll admit to having headaches which have coincided with ingesting certain artificial sweeteners.

Sprouts – I think that sprouts are generally safe, but there’s no denying that there have been some instances recently where sprouts were found to be contaminated with one disease or another.

Butter flavored microwave popcorn – Sure, popcorn with real butter tastes better, but I like this stuff too – that said, I am concerned about the factory workers who suffer from popcorn lung as noted in the article.

Food Dyes – I agree, if only because fruity pebbles and the like look so scary!

Chain restaurant ice cream – Um…no — I love ice-cream any way it comes.

Random acts of horticultural violence

I’ve been traveling in Europe the past few days working on a project with some colleagues in the Czech Republic. While we typically think of our friends in Europe as being more progressive and cultured than us, it appears there are still a few areas where they have a ways to go – such as banning smoking from restaurants and bars – and in learning about the art and science of Arboriculture. (And before the hate mail from Europe starts pouring in; yes, I realize we can find plenty of scenes like this in the US – just hoped I’d find better on this side of the pond).

I’m not a big Forsythia fan, but really…?

Not sure what the desired outcome is here.

This is a black locust near Prague castle. Black locust, which is native to North America, was introduced to Europe for forestry planting in the 19^th Century. The trees were extremely well adapted and have become invasive in many parts of Europe, out-competing native trees and suppressing the development of understory plants. This particular specimen is one of the oldest in the Czech Republic, which presumably is the reason it has been allowed to linger on. A good example of when a tree’s quality of life has run its course. It truly pained me to look at this tree. And, of course, in the U.S. the tree would probably have been long gone due to liability concerns.

The tree is mostly hollow and was once cabled together. The cables were removed after the tree lost its tops in a storm 20 years ago.

It appears that the tree’s principle function these days is feeding woodpeckers.

OK, in the interest of international diplomacy, something Europeans get right is pollarding. In the U.S. what is passed off as pollarding is usually just topping. But when it’s done right (in this case with horseschestnut) and in the right setting (Prague Royal Gardens) it can create a striking effect.

What’s in the Worm Juice?

A couple of weeks ago I mentioned that I would be taking a look at the leachate that comes from vermicompost. Here is the worm house, owned by Master Gardener Meleah Maynard, from which this leachate came. This is a picture from when the house was new — it now has multiple floors.

It has been running for a few years now, and the “ingredients” that she puts in, mostly table scraps, are pretty typical of what anyone would put into compost. She reports that it produces about a gallon of leachate every 2-3 weeks. The leachate from this house has the following properties:

pH – 8.5: That’s a high pH for soil, but for a fertilizer added every week or two it’s fine.
Nitrogen – 1120 ppm: That’s high for a fertilizer. About twice the concentration I’d use if I were applying a liquid fertilizer to my plants at home. The nitrogen is present mostly as nitrate, which is a good thing. If the nitrogen were present primarily as ammonium, that might cause problems.
Phosphorus – 22 ppm: That’s a good/appropriate concentration of phosphorus for most plants. It’s much less than we apply when we use a typical garden fertilizer. Potassium – 5034 ppm: This is an order of magnitude higher than we’d apply for most plants using a liquid fertilizer.
Calcium – 279 ppm: This is a reasonable amount of calcium.
Magnesium – 211 ppm: This is reasonable amount of magnesium.
Sodium – 634 ppm: I’d like to see less sodium, but this shouldn’t cause a major problem.
Other elements present included Iron, Copper, Manganese, Zinc, Molybdenum, and Boron, all at levels less than 1 ppm.

So what’s my conclusion? I think that, based on the nutrients and nothing else (no trials), this could be a great liquid fertilizer if it were used properly. I’d recommend diluting it somewhere between 1:1 and 1:5 worm juice : water before applying it, and I’d only apply it once every week or two. If you want to use it, try it on something that you’re not too concerned about first, just to make sure that it doesn’t do anything too terrible (It shouldn’t, but I believe in caution).

Spring fever: Conifer style

We finally got a reprieve from our wet, cold weather. Just in time for the annual inspection of the conifer troops at the Harper Collection of Dwarf and Unusual Conifers at MSU’s Hidden Lake Gardens. One of the interesting things about making repeated trips to a conifer collection like this is that different conifers stand out each time. Whether due to lighting, background foliage, your mood, whatever; it seems like there are different stars each time.

Here are some of today’s standouts.

Pinus contorta var. latifolia ‘Chief Joseph’
‘Chief Joseph’ lodgepole pine. Discovered in the wild near Joseph, Oregon where Chief Joseph, leader of the Nez Pierce once lived.

Abies concolor ‘Blue cloak’
‘Blue cloak’ concolor fir (white fir for people living on the West coast). One of the most intense blue forms of color fir – rivals virtually any Colorado blue spruce.

Sciadopitys verticillata ‘Joe Kozy’
‘Joe Kozy’ Japanese umbrella pine. Sciadopitys is one of the most primitive forms of conifers with fossils dating back over 230 million years. This cultivar was selected for its fastigiate growth by Sidney Waxman at the University of Connecticut.

And, of course, they always look great when you put them together. For more info on these and other conifers check out the American Conifer Society Conifer database.

It’s raining, it’s pouring, it’s a good time for a site assessment…

April is turning out to be a soggy month for most of Michigan and our surrounding states. While most homeowners are inclined to hunker down indoors and keep an eye on their sump pumps on these dark, dreary days; our current run of wet weather is a good opportunity to take a stroll around your property and make some notes. In particular, note any areas where water is accumulating.

Poor drainage is one of the most common sites factors that limit landscape tree and shrub survival and growth. Sites that retain water for more than a day or too after rains stop are especially problematic. The challenge with wet areas is we usually wait to plant trees and shrubs until things are high and dry and it’s easy to forget where the wet spots are.

There are two primary strategies for establishing healthy trees and shrubs in flood-prone spots. First, determine if the problem can be corrected. In some cases homeowners may be able to re-direct water flow from downspouts or other sources to keep water form accumulating in one spot. Again, these kinds of problems are easiest to spot if you go out when it’s raining. Re-grading the area or installing drain tiles are other options but these are usually require skills and equipment beyond the average do-it-yourselfer.

If correcting the drainage issue is not an option, the second strategy is to plant trees or shrubs that are tolerant of flooding. Plants vary widely in their tolerance of soil flooding and, not surprisingly, trees and shrubs that grow naturally along riverbanks and other low areas are usually the most tolerant.

This low spot in my yard was a good site for a Baldcypress

There are numerous resources on flood tolerant trees and shrubs on the web. Two of the better resources are from the Morton Arboretum and from Cornell University. Please note the Cornell guide is a large (>6 MB) .pdf file.

These Michigan holly (Ilex verticullata) I planted a couple of years ago a doing fine even though they are periodically flooded each spring.

Wet areas on your property do not have to be a ‘dead zone’, but establishing trees and shrubs in low laying areas takes some planning. The first step in the process is assessing your site and identifying the problem areas. The best way to do this is to put on a raincoat and take a walk in the rain.

Applying pesticides when you don’t mean to

I’d rather we didn’t use them, but I see their value and I appreciate what they can do for us when they’re used properly. One of the things that I hate about pesticides though is that, even when they’re used correctly, sometimes they can come back and hurt us in ways that we don’t expect. You have probably heard that you should not use grass clippings where herbicides have recently been used as a mulch because they could injure them. This is mostly because of the pesticide 2,4 D and other, similar herbicides for the lawn which can injure other plants if placed in the wrong spot.

Back in 2011 the herbicide Imprelis was used on many yards, especially in the Midwest, and did a lot of damage to spruce and other trees as Bert has mentioned in previous posts. We had thought that we were nearing the end of the effects that this herbicide would have, but now I’m not so certain (see Bert’s post from March 25). Recently questions have been asked about whether this stuff might last longer than we thought in compost. A few months ago I probably would have said that I doubted that Imprelis would linger long in compost, but, in part because of how long its effects take to show up on some plants, now I’m not so sure, and there are others who share my concerns (in fact, it was these guys who pointed out the possibility of compost problems with Imprelis to me). I honestly don’t know whether compost that includes trees that were treated with Imprelis (or has Imprelis in it for some other reason) would or wouldn’t be harmful to other plants, but I do know that it’s something I’d be watching out for.

Worm Juice!

There’s still snow on the ground, but I know that spring is finally coming to Minnesota because I FINALLY saw a crocus peeking its head out of the ground this week!

So perhaps you wonder from time to time what garden professor types get excited about. Well, here’s an example. Tomorrow I’ll be meeting up with a friend of mine, Meleah Maynard, which is nice, we always have a good time chatting, but I’m especially excited because she’s bringing me some drippings from her vermicomposting. Hooray, worm juice! I’ll be taking it to the lab and then running some tests on it to see what it has in it in terms of nutrients. After I get the results in a couple of weeks I’ll give you the information (maybe even compare it side by side with urine – that would be fun!)

The invisible, insidious presence of heavy metals

I spent the last two weeks in Spain, combining business with pleasure. It’s interesting when something that starts out as part of the pleasure ends up being business instead.

Charlotte translated this sign for me – it’s historical information. Note the brightly colored mine tailings in the background.

My daughter is teaching English in Mazarrón, a small town in the province of Murcia. The climate there is very similar to southern California, though drier and not as warm: it’s pretty much a scrubland ecosystem. Since we both enjoy hiking, we decided to take advantage of exploring the abandoned mine sites. Unlike such sites in the United States, there are no restrictions to hikers and in fact there’s signage explaining the history of the mines. This is a popular hike after a rainstorm because of the unnaturally red pools that form in the landscape.

The abandoned mine works; these buildings are over 100 years old, though this area was mined since Roman times.

It took some Internet research to find out that lead, silver and zinc were the minerals of interest extracted from these mines. For those of you who aren’t aware of how ore processing works, it includes adding various chemicals to crushed rock to solubilize and isolate the desired minerals. The leftover tailings are nearly always highly acidic and full of environmentally available heavy metals. The various metal oxides and sulfides that formed at Mazarrón are vividly red, orange, and yellow, and there is a pervasive sulfur smell throughout the site. If this isn’t hell on earth, I don’t know what is.

Mountains of mine tailings

So it was really quite a shock to both of us that not only could we walk into this mine site, but that there were no warnings regarding exposure to whatever toxic chemicals might be in the soil and water. We took pains not to touch anything – but others were not so cautious. Some hikers ahead of us watched their dog cavort through the largest of the pools, and later took photos of each other on the mine tailing spoils.

Visitors and dog and red pool of ????

Yes, the dog went in the water

And then a photo op on the side of Spoils Summit

This hideously beautiful landscape was unearthly, primarily because there was absolutely nothing alive in it. No plants, no insects, no birds. Along the edges of the mine tailings there were spring flowering shrubs, bees, and birds, just as one would find elsewhere in the region. (But not in the spoils. What an apt name…)

A blood-red seep into the pond

Crystals forming as water dries in the pools

Just off the side of the tailings, life continues

How do the mines of Mazarrón fit into gardening? Unlike this mine site, where the evidence of heavy metal contamination was clearly visible, it’s not so obvious in our garden soils. The residues of arsenic-containing pesticides, leaded gas, zinc from car tire wear, and other possible contaminants are unseen and unknown unless we have soil tests done to confirm their presence or absence. Yes, it can be expensive to have these tests done, but if we are handling our soils, breathing the dust, and eating the plants that grow there, wouldn’t it be smart to find out what’s there first?

WARNING: This post contains graphic content

As many of you know, numerous homeowners and golf courses in the Midwest experienced substantial damage to trees, especially conifers as a result of application of Imprelis, a new turf herbicide that was released by DuPont in fall 2010. If you do a google image search for ‘Imprelis’ you can see lots of photos of the typical damage we observed in summer 2011, when most Imprelis damage became apparent. The usual symptom of Imprelis exposure were brown, twisted and stunted shoots or trees killed outright.

White pine killed by Imprelis – July 2011. Photo: Bert Cregg

Shoot damage – July 2011. Photo: Bert Cregg

Today, however, I received some images from an Extension Educator in southwest Michigan that turned my stomach. So what happens when trees that weren’t killed by Imprelis try to resume growth? The results are not for the feint of heart.

‘Club-like’ shoots – March 2013. Photo: Beth Clawson.

‘Tumor-like’ growths at the ends of shoots – March 2013. Photo: Beth Clawson.

Imprelis damaged shoot cross section – March 2013. Photo: Beth Clawson.