Kansas City gardeners can breathe a sigh of relief that we did not reach the forecasted lows last of week of -20. For many years, we have been lulled into thinking that we may have shifted into zone 6. However, it only takes one very cold night to ensure that we are truly a zone 5 area. The plant hardiness zones are based on the average lowest temperatures for a 10 year period. We are about to reset those zone maps if we approach -20 degrees. Plants are rated to their zones based on laboratory tests as well as the experiences of growers in the fields. Plants rated as hardy to Zone 5 generally survive low temperatures of -10 to -20 degrees. Zone 6 plants are only expected to survive to -10 degrees.

Of course, zones are only part of the answer to how your plants will during this cold snap. Zones define large areas, but not small microclimates that exist around your home. If your plants lie in a low lying area or out on a windswept plain, they are going to have considerably more exposure to cold temperatures than if they are nestled in a protected courtyard, along a south facing wall or on the wayward side of a hill.

That being said, many plants in Kansas City are going to suffer from this cold. Dan Simmons of Show-Me Horticulture and I were talking about what effect this could have on plants. We both agreed that a few of the standouts are plants that have started being popular at retail nurseries lately despite being unproven (or proven poorly) to thrive with very cold winters such as this years. A few plants that are going to be strongly affected are southern Magnolias such as Bracken Brown Beautys, crape myrtles, azaleas, rhododendrons and other broadleaf evergreens. These are all plants better suited to Zone 6. They may have done quite well in Kansas City the last several years, but will be well-tested this winter to see if they have enough protection to survive the extremes.

Even a few proven plants will still be stressed. Boxwoods, yews, and many broadleaf evergreens will likely show some damage come next spring from the prolonged cold weather combined with dry winds that we have experienced over the last several weeks. Another group of plants that will very likely show some signs of stress will be some of the ornamental grasses such as the ornamental fescues, the Japanese Silver grasses and the fountain grasses. Some of the larger trees such as Zelkova, Golden Rain Tree, dogwoods and redbuds could suffer some superficial damage to outermost branches as well.

Unfortunately, there is not much you can do to protect your plants now. If your plants went into the winter relatively healthy and unstressed they will have a much better chance of survival than if they were stressed already. Newly planted plants will have a harder time than older, more established plants. The snow that is insulating the ground is the biggest protection we have right now and this can be bolstered if you are inclined to pile snow around the crowns of your most valuable plants. Another option that can be helpful is to build a windscreen around broadleaf evergreens to help protect them. Lastly, to help plants bounce back as much as possible, give them a good slow soaking of water as soon as the ground thaws and repeat at least monthly throughout the winter. This will help immensely as your plants begin to heal their wounds.

This spring will be quite revealing as we learn a lesson of what plants truly are able to survive Kansas City’s coldest temperatures. We will be better gardeners if we observe and learn from what nature teaches this week and choose plants that will thrive in Kansas City even during when it is at its coldest.

If you have any questions, please feel free to visit me at www.HamonsLandscaping.com or posting questions as a comment to this blog post. I enjoy talking to other plant lovers and answering any questions you might have.

Kansas City has had a record snow storm this week. Gary Lezak reports that most areas received between 10 and 14 inches in Kansas City. Although snow can be a hassle for traveling and moving around in, it is GREAT for plants.

Not only does the snow insulate the plants crowns from widely swinging temperature extremes, it also will add important winter moisture applied slowly and evenly.

You can even help your plants out with extra moisture by choosing where you toss the snow when shoveling your walks and driveways. By piling it on flower gardens and around trees you will be giving them extra moisture. However, if you used any kind of deicer or snow melting product, be very careful as concentrating these in one area could be harmful. Here is a great article on using deicers around your plants.

About the only time snow can be damaging is if it stays around for weeks and weeks without melting it can cause some disease issues. However, in Kansas City we rarely see snow stick around for longer than a week before it melts away.

So enjoy the snow and rest well knowing that your plants are well taken care of while you enjoy them from the outside.

Frost coming to Kansas City Landscaping

Many of the plants we love to plant in the fall are chosen especially because they are fairly frost tolerant. Flowers such as pansy, kale, ornamental cabbage, Hardy Mums are all frost tolerant and can extend the beauty of your garden by several weeks. A complete list of frost tolerant plants

Your lawn will not be so strongly affected by the frost. Its correlation with lowering soil temperatures will have an effect but the actual grass tissue will likely not be harmed by the frost in any way. The only caveat to this is that if you walk on frosted turf you can damage the grass blades and they will turn brown if conditions are just right. This is because when you step on the turf while frost is on the grass, you can explode the frozen tissue causing it to die away. This is just cosmetic damage but can stay visible for a long time until next Spring when new growth replaces the killed tissues.

My primary suggestion when dealing with fall frost is to allow nature to decide when its time for this years growing season will end — knowing some seasons will be longer and other will be shorter.

There has been a near media blitz this year informing Kansas City Gardeners.  However while looking at an Overland park landscape last week I saw more mulch volcanoes. 

I can fin no excuse that there are professional landscaping companies out there who still continue to pile mulch around trees.  It make me very sad to know that there continues to be companies and residents who are having there landscaping ruined by either ignorant or careless landscapers.

Here you can see the results

Notice how the bark has already started to rot away.  The darker color indicated the bark that was dying and ready to peel off.  Additionally, the picture doesn’t show it well.  However there were also multiple insect holes in the bark under the mulch.

Kansas City Landscaping with

Webworms

Have you seen webs in your trees that look similar to this?

Well, you’re not alone.  They have appeared all over Kansas City this summer.  The good news is they are relatively harmless tot eh trees they are in.  They are the protective casings made by caterpillars while they feed on the leaves of the tree.  Although the space where they are feeding will lose its leaves – next season you will not even be able to tell they are there.

They especially like birch, walnut and ash tress in my experience.

Here is a quick video that shows webworms alive in there webs.

Spraying is not necessary.  If they are unsightly – a broom works well to remove them from trees.

Lawns all across Overland Park are suffering from a disease known as Brown Patch Rhizoctonia solani.

Brown Patch is a serious infection on Turf Type Tall Fescue lawns that often can be clearly identified by the large circular brown patches that quickly appear in a lawn.  Unfortunately – what often happens when homeowners ere these patches appear they assume drought stress – since brown patchy usually appears during the first very hot humid stretch of the year.  However, this usually will only help spread the disease further since Brown patch thrives in lawns that are moist for a prolonged amount of time when night time temps remain above 70 degrees.

The good news is that Brown patch rarely kills the entire plant and rather just causes leaf tissue damage and a thinning of the turf – which will recover once fall brings cooler temperatures and more vigorous grown back to Kansas City’s lawns.

Once Brown Patch is present follow these recommendations in order of importance:

• Stop all overhead watering except in the early morning hours.
• Bag grass clippings and dispose of them off site. 
• Use a fungicide such as Prostar, Bayleton of Daconil.  These are expensive and only somewhat useful as a curative.
• Once Brown Patch has stopped spreading – fertilize with a  light .25#/n dose of nitrogen from an  organic source such as Miloganite, Bradfield’s or Espoma. 

The old adage – Plant a $5 plant in a $25 hole holds true in Kansas City’s Landscaping.

On a  recent project I planted over 70 Hostas, Coral Bells and Astible in an existing garden.  This garden had gravel already put down and the soil underneath was not great.  Normally, when making a new bed it is best to amend the entire bed with high quality organic compost.  However, this is not possible in a bed that already is covered with several inches of gravel.  So you have to amend the planting hole.  You have to be careful when doing this though.  You have to make the hole quite large in comparison to the plant you are planting.

Start by removing the rocks from where you are going to dig the hole.    Notice that the hole is about 3x as big as the plant itself.

The laws of geometry then say that you are not just increasing the volume of the hole by 3 – but closer to 9x the original plant container size so you will need to add a considerable amount of extra compost.  I use a high quality compost made from landscaping debris.    It is tested regularly to ensure its purity of toxins. 

After mixing the compost with the native soils – carefully plant the plant.

With Coral bells specifically – Be careful of their crown and make sure that crown of the plant is carefully planted just below the surface.

Then slide the rocks back in place around the plant.

Each plant can take upwards of 10 minutes to plant carefully and correctly.  So it truly is a $25 hole for a $5 plant.  However, The long term growth and vigor of the plants will be worth it to the customer.  However, with 70+ plants to plant – it is not a quick job.

One of the landscaping projects I am most excited about this year is the remaking of a new clients complete backyard in Brookside.  These clients called me in April, looking to have the work done by their wedding in May.  In order to get things done in time I knew we would have to work fast to be able to schedule, plan and get everything ready.  Right now, we are on track.

The Landscaping Plan

The plan was fairly simple and drawn out on the spot since we were going to have to move fast.  Essentially, we will be removing all the existing shrubs in the back since they were not part of a cohesive plan.  New beds would be created around the perimeter of the property and then new sod would be installed.

The Plants

Here are the plants that we will be using in this landscaping project.

The Dirt

Dirt is quite a misnomer.  I don’t use dirt for many of my Kansas City Landscaping Projects.  This is 8 yards of pure compost.  Generated organically from a local yard waste recycling center.  It is the single most important thing to the the landscapes I plant not just surviving, but thriving.  This dirt will be spread out and tilled into all bed and new lawn areas.

The Removal

A lot of plants had to be removed before anything else could be accomplished.

Once all the shrubs were removed.  This is what it looked like as it filled my trailer! There is a lot of plant material in that trailer !

Moving the Dirt

Here are progress shots as the

compost is trucked around to the back.  Because of the layout of this yard, the dirt could only be moved by wheelbarrow.  10,000 – 12,000 pounds of compost was used for this project.

That was the stage 1 of the project.  Next, will be the more exciting part of preparing the beds and installing the plants.

Stay tuned

This year, Kansas City Landscaping has seen a Spring that was more gradual than in past years.  This has been good for the plants and lawns in Kansas City .  Consistently cool Kansas City temperatures with only rare and short warm-up have allowed us to gradually slip into Spring and avoid the landscaping pitfalls of moving too fast.  Landscapers like slow springs because very few plants have been hurt by April freezes this year and although it has been fairly dry the plants have faired well.  However, gradual will soon give way to rapid growth as soon as we get some heat.  Lawn Mowing will soon be the most common weekend chore for most Kansas City homeowners. 

Blue Grass and Fescue lawns have thrived in this slightly cooler temperature.  They have been growing laterally and down for the last several weeks.  The imminent heat will spur rapid upward growth – we will soon be mowing VERY often!

One of the negatives of this low soil temperature ahs been for any new spring lawn seeding.  The grass has not grown much at all if any.  That is again due to cooler than normal soil temps.  This may not be a great thing for Spring seeded lawns since it simply will not have the time needed to grow before summer heat sets in.  However, if my inside sources at NBC Action News are accurate, we may have a cooler than normal Summer which would be good for all of Kansas City’s lawns. 

Its a purely human phenomenon – really. If you see a mistake repeated often enough then it becomes perceived not as a mistake, but as the way things should be done. This is being done in Kansas City Landscapes right now

This is the case with the dreaded Mulch Volcano. Mulch volcanoes are not a Kansas City landscaping phenomenon, they effect cities all over the US

.

Despite recent public campaigns by The Johnson County Extension Office and the City of Overland Park, there are still instance found all over the city.

The above example was just yesterday ata very nice office park. I am sure that the manager of this office park paid good money to a “reputable” landscaping company to maintain their landscaping. However, what has now happened is that these trees have been forever weakened by this ignorant practice

When mulch is spread more than 2″ thick against the base of a tree several things happen — and none of the m are good. First, the mulch will hold moisture against the trunk pf the tree. This si dangerous because it encourages rotting and disease. It will also rot the bark away adding additional avenues for insects and disease to attack the flesh of the tree. Roots are also damaged by the moisture held in the mulch because they will grow upwards seeking this moisture. As they do they will begin to circle the trunk. These circling roots will eventually kill the tree byessentially strangling it.

How should trees be mulched then? Trees should be mulched 2″ – 3″ thick (about one finger deep) and all mulch should be pulled away from the trunk of the tree truck 2 or 3 inches. Think doughnut instead of volcano. How big you want the mulch ring to be is up to you. Ideally — it should extend to the drip line of the tree — but that is not always practical or aesthetically the best choice. However, a good minimum is a 6′ diameter.

Here is what a tree looks like when you peel away the mulch volcano after several years. This particular was at a new customer in Overland Park that I started working with this season. I did not pull the mulch away — it was done before he had moved in. You can see that this tree will NEVER be a beautiful specimen again and will likely die prematurely from earlier neglect.

Mulch volcanoo aftermath