Posted on Thursday, May 12th, 2011 by George Weigel


Rain puddled in grass
One of these days we’re going to get just the right amount of rain.
April’s record rainfall – not to mention the assortment of windstorms and tornado-touchdowns – were excessive to the point of rotting roots and blowing over trees. And the poor farmers couldn’t even get into soggy fields to plant wheat and corn.
Harrisburg set an all-time record for most rain in an April. We got 9.46 inches, which shattered the old record by an inch and a half! So you weren’t imagining all of that water.
Now that frost-free season is here (May 11 is Harrisburg’s all-time-latest “official” killing-frost date), things should dry out and warm up.
We’re behind in growing-degree days, and all of the coolness and cloudiness has caused a lot of plants to just sit there and wait for some sun energy.
I’m betting we’ll see growth in fast-forward the next few weeks as plants play catch-up from this delayed start.
I’m also betting on Murphy’s Law. We’ll make up for spring’s ridiculous rainfall by getting little to nothing over summer so the year averages out just right – on paper.
Enough whining, though. Here’s my take on what the wet spring means for us at this point. I’m a little worried that the soggy soil did more damage than we think.
Most evergreens and many shrubs don’t do well with wet feet for more than a few days. We had so much rain so often that water tables kept low-lying and poorly drained spots soggy for that long.
Wet soil suffocates roots gradually. Maybe enough damage wasn’t done to kill a plant immediately, but when water demands go up in summer, enough roots might not be left to keep up. And that’s when an evergreen or shrub mysteriously croaks.
Hot weather or dry soil might get the blame then, but in reality, it was loss of roots from soggy soil that set up the fatal scenario.

Rain accumulation on pathway
I hope I’m wrong or that we don’t get a hot enough, dry enough summer to make that happen.
Another thing that worries me is the soil damage done by gardeners who got out there and mowed lawns or dug gardens when the soil was still wet.
So much of our area has clay soil, and that already leans toward being compacted because of the small, easily-packed particles.
Riding mowers over wet lawns squishes the air out of soil. So does tilling wet clay. When it dries, you’re left with something more akin to brown concrete, and that doesn’t bode well for root growth.
This is another one of those sneaky problems in which something else gets the blame when plants struggle.
In this case, a lawn might be quicker to brown out in a drought or a plant quicker to die from lack of water because the roots just couldn’t penetrate that compacted soil as well. Once you destroy the soil’s structure, it’s very hard to fix. Working compost into a garden can help, and core-aerating in fall can improve a compacted lawn. But an easier solution – painful as it might be for an impatient gardener – is to stay off that wet soil in the first place.
This is also a good argument for raised beds. They drain much better than level, clay-infested beds.
Of course, raised beds dry out faster in summer, which means more watering then.
The record-setting rains also sent weed growth into high gear and increased the incidence of some plant diseases.
Plant pathologists are already warning of all sorts of anthracnose, rust, leaf spot, fire blight, black spot, scab and other diseases that run rampant in wet springs.
Not only does constantly wet foliage feed many plant diseases, it’s difficult to get fungicides in place that would head off the disease. As soon as people spray, rain washes it back off.
On the plus side, though, the rain helped newly planted and transplanted woody plants; it got our lawns off to a spectacular start; it led to a very nice spring bloom (albeit it a bit later than usual), and it put our wells and aquifers into great shape heading into the drought that’s probably going to begin any day now.
Just ask Murphy.
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