Too much rain causes waterlogged garden soil

Gardeners in our area are having to deal with unusual amounts of water in their gardens. The amount of water in the soil is more like what we would see in early spring after the snow melt rather than late June or early July.

Driving around I see standing water all over our area with no place to go. Soils in many places are waterlogged which means big trouble for plants.

Most plants are able to cope with a day or two of flooding but after that, complications start to set in. The biggest problem is a lack of oxygen in the soil. Plant roots need oxygen to function.

All types of soil contain air spaces between soil particles. Fine textured soils with a lot of clay, have very small air spaces while sandy soils have large air spaces. This is very important because plant roots need access to soil air, they can’t efficiently use the oxygen dissolved in water.  When we have too much rain, these air spaces fill with water. Once that happens, the plant roots begin to drown and eventually die.

A water damaged plant, curiously enough, shows symptoms exactly like a plant that has been growing in a drought. In the case of a drought, there is not enough water for the roots to absorb so the upper part of the plant wilts. With a waterlogged plant, the upper part of the plant also wilts because can’t the roots have stopped working so no water gets moved into the upper parts of the plant.

After a the soil returns to normal, plants need to be watered more often because they have fewer roots. Often, if the damage is not too bad, the plant will recover by growing more roots to replace the ones lost by drowning. If it the damage is too great, the plant will be stunted and never be able to live up to its potential.

Raised beds are helpful in low lying areas.
Raised beds are helpful in low lying areas.

Another problem, especially with a vegetable garden, is the potential for contamination. In urban or suburban neighborhoods where all sorts of properties are nearby, there is the potential for flood waters to carry contaminants like bacteria or chemicals. Think of that dog kennel down the street or that parking lot with runoff water carrying motor oil and other debris.

You may want to think twice about eating vegetables exposed to contaminated flood water.

Bob

Moth mullein welcome in the garden

There’s some new unexpected members to our garden family of plants this year. It is a group of moth mullein plants.

I’m not really sure how they got there. I figure they most likely hitched a ride as seed in soil from some other plants that I transplanted from someone else’s garden a couple of years ago.

Since moth mullein is a biennial, it takes two years to bloom. The first year for all biennials is a nondescript growing stage which is why I hadn’t noticed the mulein until now. If I was a more tidy gardener, I probably would have pulled them out last year thinking they were some kind of weed seedlings.

Moth mullein is a non-native species so, many people consider them actual weeds. Originally they were brought to this continent as a decorative flower and useful herb — it has some insecticidal properties.

Moth mullein in bloom.
Moth mullein in bloom.

While it may be an immigrant to this country, moth mullein seem to have very little impact on the native ecosystems of our area. They really can’t compete with well-established native plants. However, each plant produces thousands of seeds a year and tilling the soil tends to stimulate their germination. In the garden they may eventually wear out their welcome. In some states they are classified as noxious weeds but not here.

American goldfinches feed on the tiny moth mullein seeds. I saw a pair of goldfinches checking out my plants today. The seeds are not ready yet, so they decided to leave before I could get a photo of them. The seeds are pretty small, about one millimeter long, and can sprout even after laying for a hundred years.

I’m not too worried about the mullein taking over my garden just yet. They are behaving themselves in a very dry flower bed and are only a couple of feet tall. In your garden, if it has fertile soil and is well watered, they might grow twice that size.

Moth mullein is a perfect candidate for an English cottage garden where plants are expected to reseed themselves year after year.

Seeds are available through mail order seed catalogs and online sellers. Of course you can always collect some from the wild since they are not endangered nor invasive in Michigan.

Bob

Easy to grow iris give plenty of color

Iris are one of my favorite flowering plants for a number of reasons but mainly it’s because they are so easy to grow compared to some other plants. I’m not the only that knows this which is probably why you see so many irises in gardens.

Although there are several types of irises, the one that everyone thinks of when you say “iris” is the bearded iris sometimes called German iris. Irises put on quite a show in return for comparatively little effort on our part.

Iris

Irises are perennials, which means plant them once and they’ll come back again year after year. They are very resilient plants and are quite cold tolerant. Ours when un-mulched, came through two extremely cold winters and never missed a step.

Bearded irises require well-drained, sunny locations to thrive. Soggy soil, especially during the summer, will cause their roots to rot. On the other hand, they need plenty of water during the early spring, shortly after they wake up from their winter dormancy. Around here, we usually get enough rain in the spring for them to be satisfied.

The most common mistake beginners make when planting iris is to place them too deep into the ground. Only the bottom two-thirds of the root rhizome gets covered with soil. The other on-third is above ground as I heard someone say, “like an alligator”.

German irises grow so prolifically that they will over-crowd themselves over time. So, every three or four years they need to be dug up, divided and replanted. It’s a relatively easy thing to do and you don’t have to worry much about hurting the plant. I’ll discuss this in a post later on this summer as we get near thinning time.

Bob

Rare opportunity to see blooming satsuki bonsai azalea

I think just about everyone enjoys looking at bonsai, the Japanese art of growing miniature trees in containers, Even those who are not particularly interested in plants will stop and take a second look at bonsai.

The University of Michigan Matthaei Botanical Gardens near Ann Arbor, is offering a rare treat this month, Magnificent Miniatures a showing of satsuki bonsai azaleas in full bloom.

satsuki bonsai

The plants are on loan from Dr. Melvyn Goldstein a renowned bonsai collector from Ohio.

satsuki bonsai

The bonsai are flowering right now. And like other flowering plants, the flowers only last for a short period of time.

satsuki azalea bonsai

The show is free and runs from June 6 through June 14, 10 am – 8 pm daily. It’s an easy drive to the Gardens from anywhere in southeastern Michigan. The address is 1800 N. Dixboro Road, Ann Arbor.

It might not be a bad idea to call ahead to make sure the bonsai are still blooming 734-647-7600.

Bob