Author Archives: Leif Knecht

Summertime Planting

Summer planting is successful planting.  Long warm days give newly planted trees, shrubs and perennials all the daylight they need to establish new root systems over the remainder of the summer and fall. Simply provide each plant with adequate, but not excessive moisture and nutrition, and they are sure to follow their internal genetic programming [...]

Alternatives to Ash Trees

The establishment of the highly destructive emerald ash borer in Minnesota will once again force us to re-evaluate what type of trees we should be planting.  When Dutch Elm Disease devastated our urban and native forests starting in the 1950′s the same question was asked since so many communities had planted such large numbers of [...]

White Barked Birch Trees

Have you ever admired a group of white barked birch trees in the North Woods?  Or perhaps you’ve noticed a graceful clump of white birch serving as a focal point in a neighbor’s landscaping. Wherever they are found in our natural woodlands or urban landscapes, white barked birches of many varieties seem to catch our [...]

Ash Trees

With the serious pest – Emerald Ash Borer – now present in the State of Minnesota, people will be interested in ways to protect their trees.  A once a year soil drench of a solution containing Imidacloprid will prevent the Emerald Ash Borer from doing significant damage.  Application is extremely easy for homeowners, and quite [...]

Keep watering your Plants!

It’s time to water your landscape plants.  Mother Nature has been pretty stingy with rainfall these past couple of years, and the subsoil is now pretty dry. In normal times when the surface soils dry out, subsoil moisture is available to gradually percolate up, or be drawn out by the large root systems of established [...]

Prairiefire Flowering Crab & Creeping Phlox

Now that spring is sprung and the growing season is well under way, we can enjoy some of the real glories spring has to offer.  Flowering crabs have been putting on a show in recent days, and one of my all time favorites for eye popping color is the Prairiefire Crab.  Prairiefire seems to blossom [...]

Red Maples – acer rubrum

The last 2 to 3 weeks, your eye may have caught the lovely red blossoms of the Red Maples that are trying to make seed.  Each spring when rubrum maples wake up, the first thing they do is push out their flowers and pollinating structures.  This creates a beautiful red glow throughout the entire crown [...]

Tending to your Lawn

The first 3 ½ weeks of April was very dry, but a nice slow soaking inch of rain in the Northfield area on April 26/27 has really helped green things up and add moisture that will be needed to get spring gardens off to a good start. It’s time to plant grass seed in the [...]

Planting a Potted Tree – Part 2

In my blog last week on planting a potted tree, explaining root pruning prior to planting, I promised that the next blog would cover the width of the hole.  Dig wide holes – no deeper than the height of the root ball of the tree, shrub or perennial you are placing in your landscape.  How [...]

Northern Pin Oak

The Northern Pin Oak – (Quercus ellipoidalis) is a lovely native tree that can handle a wide variety of soil types, and shows excellent reddish fall color, as well as a nice rusty brown throughout the winter since it is one of the varieties that usually holds spent leaves on the twigs almost until the [...]

Planting a Potted Tree

The two most important things you will want to do when planting a tree that has been grown in a plastic nursery pot are to root prune aggressively prior to planting, and to dig a hole of the correct depth and width.  Root pruning?  What’s root pruning you say?   Root pruning cuts or removes tree [...]

Tree Pruning

During late winter and early spring yards and gardens can often look their worst.  The grass is brown and sometimes damaged by winter stress, pets, de-icing products leaking off sidewalks, driveways and streets, snow plows, squirrels, and even foot traffic.  The tops of perennials that may have provided some winter interest are now tired and [...]

Prime Time for Planting Trees

While modern methods of raising and packaging trees for use in the landscape have enabled homeowners and landscapers alike to successfully plant trees all season long, there is no doubt that spring is thought of as prime time for tree planting. Once a tree has been properly planted, the name of the game is enabling [...]

Transplanting Time

Perhaps you’ve been thinking about digging and dividing some of your perennial flowers, or found that you planted some kind of shrub in a spot that is too shady, and now after a year or two want to move it to a little sunnier spot.  The time of transplanting is upon us. Some sunny areas [...]

Last Call for Pruning Oaks & Elms

I will also be sharing some of my blogs for blog entries at the Northfield News. To prevent the transmission of diseases such as Oak Wilt and Dutch Elm Disease, it is best to prune these varieties during the late fall, winter and very earliest part of spring. Up until about April 7th, you should [...]