Category Archives: Trees

Container Gardening, Strawbales, and Redbuds

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With the warm weather (and spring) finally here – it has a been a blur of activity here at the garden center.

This past Thursday evening, we hosted a container gardening workshop. There were beautiful containers created and fun shared by all.   Grace Ramos did a wonderful job of helping everyone with the creation of their containers!  We look forward to holding this workshop again next spring!

We have a great assortment of specialty annuals, the thrillers, spillers and fillers for your containers!  For those not wanting to create your own container – we have many beautiful hanging baskets or we will gladly plant your container for you!

We have gotten in straw bales now for those needing bedding for their gardens, strawberry patches or for the straw bale gardens.

OLYMPUS DIGITAL CAMERAThe beautiful Redbud trees have taken over the spotlight now that the Forsythia trees have lost their flowers.  Pictured here is our grouping of Redbuds we have planted in our yard at home.  These trees have been here for several years and each spring, delight us with their rose-pink blossoms which are exceptionally bright in the early morning light.  The Redbud likes moist, well-drained soil and should be planted in a protected area.  It will reach a mature height and width of approximately 20′.  They are available in single stem form as well as clump form.   We have many Redbuds to choose from!   Enjoy spring – plant a Redbud!

 

The Awakening

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It’s happening.  The awakening has begun.  Anticipation has been building since the oak trees started dropping acorns last September.

For some fifteen years I have collected acorns from the mighty oaks of southern Minnesota in order to grow oak trees that have been genetic strengthened by the interplay of our harsh climate, extremely varied soils, and the process of natural selection over thousands, if not millions of years.  The acorn crops vary wildly in size and quality from one year to the next, creating a challenge not only for seed collectors, but also for the many kinds of wildlife that depend on acorns as a source of high energy food.

During the fall of 2012, I wasn’t seeing a good acorn drop in the Northfield area, so I contacted Brad Gatzloff of Zumbro Valley Forestry, and he graciously provided me with four small batches of sound acorns from white oaks, bur oak, N. Pin Oaks, and Northern red Oak.  October found us planting these precious seeds into very special propagation pots and trays that are designed to air prune the root systems as the small trees grow, producing the very best root systems that yield high success rates when planted.  Since oak trees have long been considered difficult to transplant, the opportunity to grow oaks with root systems that make planting success easy to achieve, is a welcome and existing development.

Each time I plant an acorn, I think of the towering oaks in the woods where I live, and how some day that little acorn could become a beautiful source of cooling shade, nesting habitat, critter food, and eventually building material and fuel.  It’s amazing what can come from these hard little nuts, if only we have the faith and foresight to plant them.

Now after a winter in cool moist potting mix, the acorns Brad brought me are awakening.  First cracks appear in the hull, and soon a single root is just barely visible as it pokes out the pointed end of the acorn and turns downward to penetrate the mixture of peat and composted pine bark.  This root develops for anywhere from a few days to a few months before the day finally comes when a shoot pops up from the acorn and heads skyward, producing first one set of leaves, then another, and soon it begins to actually look like a tiny oak tree.

Today is Mother’s Day 2013, a day to honor the women who have given us life, love and who nurtured our awakening from helpless infants to capable and self-sufficient adults.  It’s also a day when I will celebrate the awakening of all life, as spring really unfolds across a landscape draped in the vibrant light green of brand new leaves.

Can you feel it?  Can you hear it?  The web of life awakens.  Spring is finally here.  Wildflowers are blooming in the woods, a mother duck walked her 13 ducklings right through the middle of the nursery yesterday, and in greenhouse #10 – acorns are awakening.

Forsythia and Magnolia

Forsythia - Shrub form

Forsythia – Shrub form

Magnolia

Magnolia

Forsythia - Tree form

Forsythia – Tree form

What’s doing the blooming this week?   The Forsythia – both the shrubs and tree form are absolutely beautiful with their buttery yellow flowers brightening up the landscape!  The Magnolia trees!   Awesome.   Almost every street that I went down yesterday here in Northfield had either a Forsythia blooming or the white Magnolia flowers seeming to shine brilliantly.  After such a long, long winter – or such a late spring – seeing these plants blossoming is such a welcoming site.

In the picture of the Forsythia shrub – you will notice that the surrounding plants are just starting to push their buds / leaves.  This is what makes the Forsythia such a great plant.  It’s early to blossom so you can extend spring color by planting Forsythia in your landscape.  Once the flowers fall away – the bright green leaves provide a backdrop to the next layer of either late spring color or early summer color.   The Magnolia picture here is pruned to this shape – and needless to say – it is eye-catching.

We have Forsythia in stock and shrub form Magnolias.   The tree form Magnolias start to arrive this week!   Stop in and get a dose of Spring!

Autumn Gold Ginkgo

 

Photo courtesy of Bailey Nurseries

Photo courtesy of Bailey Nurseries

Autumn Gold’ Ginkgo has the distinctive appearance and outstanding architecture to be a tree that turns heads from its youth through middle age and especially in maturity.  Very pest resistant (including Japanese Beetle), ‘Autumn Gold’ Ginkgo grows quite symmetrically with a strong central leader, and almost horizontal layered branching that becomes more a part of the visual appeal with each passing year.

            Unique fan shape leaves unlike any other tree variety are another appealing aspect of ‘Autumn Gold’ Ginkgo.  These leaves turn a beautiful buttery yellow in fall.  ‘Autumn Gold’ Ginkgo is a male clone that is seedless.  This means that ‘Autumn Gold’ Ginkgo will not produce the messy and foul smelling fruit that can be produced by a female Ginkgo tree. 

            ‘Autumn Gold’ Ginkgo tolerates a wide variety of soil types and difficult urban conditions which makes it more likely to be successful for most property owners.  While it is initially slow growing during its first several years of establishment, ‘Autumn Gold’ Ginkgo can easily grow two feet or more per year, making it a fairly good grower.

            A mature size rating of 50 feet tall by 30+ feet wide make ‘Autumn Gold’ a large shade tree that is likely to become one of your favorites.  Plant ‘Autumn Gold’ Ginkgo in areas with good drainage and enjoy the show as year by year this stately tree adds layer upon layer of beautifully tiered branches.

            For homeowners who want the beauty and versatility of a Ginkgo, but desire a tree that is not as broadly spreading, there are several nice choices available that all have a narrower profile/width.  ‘Princeton Sentry’ Ginkgo is rated at 20-25 feet wide, ‘Magyar’ Ginkgo at 25 feet wide, and ‘Elmwood’ Ginkgo at 10-12 feet wide, and all are male clones that are seedless

Autumn Brilliance Serviceberry

Autumn Brilliance Serviceberry is a lovely small tree/large shrub that shines in many seasons of the year.  Cold hardy all the way to the Canadian border, Autumn Brilliance Serviceberry naturally develops a multi-stemmed structure with strong branches and interesting architecture.

            Early each spring Autumn Brilliance Serviceberry produces bountiful massess of lacy white blossoms before the leaves are fully developed.  This allows every blossom to be visible for maximum effect, which is both delicate and impressive. 

            For certain landscaping and urban uses, Autumn Brilliance Serviceberry is pruned and trained into a single stem tree form.  This allows it to be used in smaller gardens where the design calls for perennial and small shrub plantings under the tree canopy.

Photo courtesy of Bailey Nurseries

Photo courtesy of Bailey Nurseries

 

            Serviceberries exhibit some salt tolerance, which is one reason we increasingly see the single stem tree form of Autumn Brilliance Serviceberry used on boulevards and highway beautification projects.  A common name for serviceberry is Juneberry, because of the tasty purple/black fruit that is produced in large quantities in June and throughout July.  The fruit is enjoyed by birds, and I enjoy it for fresh eating.  One of my favorite times of the year is when I can pick and eat the Autumn Brilliance Serviceberry fruit produced by the plants we have for sale at the nursery.

            As the name would suggest, Autumn Brilliance Serviceberry produces a nice fall color show of mixed red/burgundy and some yellow.  Allow plenty of room for growth of the Autumn Brilliance Serviceberry, as they can mature to a somewhat rounded size of 20 feet high by 15 feet wide.  The smaller close cousin is named Regent Serviceberry, and matures to a much smaller size of about 6 feet high by 6 feet wide, which is often an excellent choice closer to buildings.

Firebird Flowering Crabapple

Firebird’ dwarf white flowering crab is a winner in every way.  Extremely disease resistant, ‘Firebird’ dwarf crab keeps nice, clean foliage throughout summer and fall.  This is a great improvement over some of the old fashioned flowering crabs.

            ‘Firebird’ crab requires little pruning to maintain a compact rounded shape, and is covered by a mass of beautiful white blossoms every spring.  ‘Firebird’ is a true dwarf that is grafted on a 42” or 48” standard, and has a mature rated size of ten feet tall by eight feet wide.

Photo courtesy of Bailey Nurseries

Photo courtesy of Bailey Nurseries

 

            Birds love to nest in the protective and dense branch structure of ‘Firebird’ crab and in early autumn this handsome dwarf produces a huge and showy display of small red fruit that hangs tightly on the tree throughout winter.  The fruit is a colorful treat for the eye all fall and winter, giving ‘Firebird’ crab year round appeal.

            The small and tidy growth habit of ‘Firebird’ crab makes it an excellent choice for intimate garden spaces, and it is very useful under power lines since it stays small enough to avoid being butchered by the power line maintenance crews and requires minimal pruning.

            If you are looking for a first rate dwarf flowering tree, I’d suggest you consider ‘Firebird’ crab.  You won’t be disappointed.  ‘Firebird’ crab is truly a tree for all seasons. 

 

Firefall Maple

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            Firefall Maple is a little known but excellent hybrid maple variety developed with the combined efforts of the University of Minnesota and The Minnesota Landscape Arboretum.  This homegrown maple is a close cousin of the immensely popular and well known Autumn Blaze Maple and actually has characteristics that some consider superior to Autumn Blaze.

            Firefall Maple grows quickly, tolerates a wide variety of soils, and withstands drought fairly well once established.  Both Autumn Blaze and Firefall Maple sport showy red flowering/pollinating structures early each spring.  Firefall Maple is a strictly male tree that produces no seed crop, while Autumn Blaze produces a noticeable crop of seed each late spring.  Many homeowners may prefer Firefall Maple for its lack of seed litter.

            Another fine attribute of Firefall Maple is the consistently excellent branch angles of attachment to the trunk, which produces very strong branches that resist wind, snow and ice damage extremely well.  This also means less need for pruning on Firefall Maple than Autumn Blaze Maple.

            While both Autumn Blaze and Firefall Maple produce gorgeous red/orange/burgundy fall color, Firefall Maple shows its color a bit earlier in the fall.   This can help the consistency of fall color from year to year.  Other hybrid maples that color later may “freeze green” if hit by an early hard frost before having a chance to develop their best fall color, while Firefall Maple is likely to attain its full glory of fall color by turning earlier.

            Firefall Maple reaches a height of 50-60 feet tall and spread of 30-40 feet wide.  The fairly restrained width may make Firefall Maple a good choice for spaces where a really wide spreading variety would overwhelm.  The pleasing upright, oval form of Firefall Maple makes for a handsome tree, and distinctive deeply lobed cut leaf foliage adds to the appeal of Firefall.

            If you give Firefall Maple a try I think you will be please with its many outstanding features.

A Lifeline for Birds

OLYMPUS DIGITAL CAMERAWinter is a time of stress for most wildlife, and often the most crucial period of the winter is the last few weeks.  If wildlife is able to locate at least some type of food in the days just before new vegetation emerges and insects become active, it can mean the difference between life and death.

This is certainly true for many of our beloved songbirds, as cardinals, goldfinches, juncos, chickadees, purple finches, house finches and various woodpeckers visit feeders in large numbers.  The extremely drawn out late winter of 2013 is a prime example, as literally hundreds of birds have been flocking to the sunflower, finch seed and suet feeders the last several weeks.  It seems there just isn’t much else available for food, so they are targeting the handouts from humans in numbers I have never seen before.

During this same period of time, I have observed wild birds targeting two types of trees for food and shelter during this stressful time.  Flowering crab trees of certain varieties that retain their fruit on the branches throughout the winter are now being visited in large numbers by robins and other songbirds, as they gobble up the fruit that has become more tasty and nutritious due to the freeze thaw cycles of an entire winter. Read More »

Ironwood Trees

It’s April 14th and I’m looking out the window of our home office on a VERY dreary, 38 degree, late winter (where is spring?) day.  Cold rain has been fairly steady most of the day, and it has made only moderate progress melting the snow cover in the woods.

            The landscape I’m looking at would be REALLY BLEAK except for two things.  Songbirds of the hundreds are visiting our feeders today, and Ironwood trees are adding a nice counterpoint to grey and white as they display the leaves they have retained all winter long.  After hanging on the trees for almost seven months since going dormant in early October, the ironwood leaves still add a rich color pallet to my view across the woods and to the Cannon River Valley beyond.

            Some leaves are a light parchment, others tan, and yet others a rich and delicate brown.  The varied hues form lovely layered horizontal bands of subtle, but lively color that dance and sway with every breeze.  The ironwoods are quite hard to beat for all the extra richness and depth they add to my winter woodland landscape. 

            Ironwood are versatile native trees.  I often see them pioneering in disturbed areas, abandoned pastures and vacant farmsteads, and along forest edges.  This might lead one to believe that Ironwood are a sunny area tree, but in fact they are better known for their shade tolerance, and ability to provide an extra dimension in the Oak/Maple/Birchwood forest ecosystems that are remnants of what is sometimes termed “Minnesota’s Big Woods.”

            As its name indicates the wood of Ironwood trees is extremely hard when cut and dried, and was used by pioneers for many different uses such as fence posts..  Foresters who are focused on timber production sometimes target Ironwoods for removal from the hardwood forest because they compete for water and nutrients with Sugar Maples, Oaks and other hardwoods that are harvested for saw logs and veneer.

            Ironwood is lovely in other seasons besides winter.  In spring fresh green leaves emerge, and as they mature achieve a deep veining that give each leaf a really striking appearance.  By mid-summer Ironwoods produce a somewhat nondescript flower that matures into a delightful looking seed structure that has a passing resemblance to hops forming on the vine.

            Ironwood also makes excellent firewood with lots of BTU’s stored in the dense and hard wood.  Dry two years split and stacked in a sunny, windy area to have firewood that burns beautifully instead of smoking.

            Knecht’s Nurseries and Landscaping stocks container grown, Ironwood trees for your enjoyment.

           

Autumn Blaze Maple

OLYMPUS DIGITAL CAMERAVery few landscape plants have achieved the popularity and success demonstrated by Autumn Blaze Maple over the last twenty years.  Autumn Blaze Maple has attracted millions of buyers with its rapid growth, drought tolerance once established, versatility on many soil types, pleasing shape and stunning red/orange fall color.

For property owners who want shade sooner rather than later, Autumn Blaze Maple can be an excellent choice.  Even if you go low budget and plant an Autumn Blaze Maple that is only 8 feet tall and one inch trunk diameter from a #7 or #10 nursery pot, most of the time the tree will reach a size of 30 to 35 feet tall and 10 inch diameter in an average of only ten years.  If you start with a 3”-4” diameter Autumn Blaze Maple that is about twenty feet tall at planting time, you can have a tree 45 feet tall in ten years.  This is pretty significant shade in a relatively short time.

Autumn Blaze Maple is a tree that prospers when we administer tough love for trees.  Simply put, the very best care of Autumn Blaze Maple is to prune it early, often and aggressively the first ten years after planting.  Aggressive pruning every other year to remove weakly attached branches that come out of the trunk at very steep upward angles will leave you with a gorgeous and strong shade tree that can withstand violent thunderstorms and winter ice storms.  After being pruned aggressively 4 or 5 times early in life you will have an Autumn Blaze Maple with lower angled branches that are very strongly attached to the trunk and a lovely tree that puts on an annual fall color show of blazing red that is hard to beat.

Mature size is about 60 feet tall x 45 feet wide, so allow plenty of space for growth when you pick the planting location for your Autumn Blaze Maple.

Northern Sun Forsythia Tree

OLYMPUS DIGITAL CAMERAThis year it’s hard to believe spring will ever arrive, but I do have faith that in just a few short weeks the Northern Sun Forsythia tree in my yard will be an explosion of brilliant yellow blossoms.  Specialized pruning and staking early in life is used to turn a Northern Sun Forsythia shrub into a tree.

One of the reasons I am a big fan of the Northern Sun Forsythia tree is that it is one of the very first landscape plants to flower every spring.  Another big plus is the flower and hardiness of the North Sun Forsythia tree.  We have seen vigorous blossom production above the winter snow line on the Northern Sun Forsythia tree even after a winter when they went through a cold snap of 30 degrees below zero!

 This is a small tree that is very useful in just about any landscape setting.  Avoid placement in heavy shade or poorly drained areas.  This year consider giing your landscape a burst of spring color with the Northern Sun Forsythia tree.

A Pleasant Antidote

March 20, 2013, Northfield, MN.  My weatherguide calendar indicates that today is the first day of spring in the northern hemisphere.  A look outside my window reveals a thermometer reading 5 degrees Fahrenheit and ice glazed snowbanks completely covering the ground.

Just a year ago mid-March saw nine days of record high temperatures and one of the earliest springs I can remember.  So go the remarkable variations of Minnesota winter weather.

A practiced brand of northland stoicism runs strongly through our veins, breeding an especially strong love of gardening in many of us.  I believe the nurturing of rich soils, bountiful crops and dazzling flowers is our antidote for terrible winters.

While winter can certainly display its own brand of severe beauty in a multitude of ways, I think that by the end of a Minnesota winter most of us feel a deep need for rejuvenation of body and soul.  The miracle of plants coming to life after the long sleep of winter is a surefire cure for the winter blahs IF we allow ourselves to be outside and engaged with fields and forests, gardens and meadows, lake and streams.

No cathedral can surpass the majesty of a carpet of wildflowers exploding from a forest floor or a sunny meadow.  Even the best preachers have only faint hopes of energizing and uplifting our spirits as surely as a redbud tree in bloom or a bed of daffodils.

The spiritual rebirth we can experience as we work in our gardens is a powerful antidote for sluggish bodies, sagging spirits and frayed nerves.  In every country, climate and culture, the satisfaction of planting and nurturing the crops that sustain us and gardens that dazzle the eye transcend national boundaries, and political, ethnic, and religious differences.

I have a deep and abiding belief that planting a flower seed is an antidote for spiritual doldrums.  I believe that planting a crop that feeds people is an antidote for the insecurity of whether our basic needs for survival will be met.  No matter what task we do in our gardens,  we savor the satisfaction of nurturing something fundamentally good.

The planting of a tree is an antidote for all who seek relief from the relentless rays of the summer sun.  Patience is required.  One generation plants the trees.  The next generation enjoys the cooling shade.  By investing in the forests of the future, we reconnect ourselves to the primal wisdom and satisfaction of ancient ancestors.

As winter’s grip finally loosens give yourself permission to take the antidotes for cabin fever.  Prune a tree.  Remove the spent tops from a perennial garden.   Design your next new planting bed or landscape renovation project.  Start some annual flowers and vegetables from seeds.

Whatever you do, make sure it’s something connected to or out on the land.  When we are active outdoors, we administer to ourselves the antidote for an awful lot of the ills that plague human kind.

 

Overlooked Spring Color

Redpointe Maple

When we think of beautiful spring flowering trees it would be easy to overlook northern hardy Red Maple trees.  The commonly recognized flowering trees include magnolias, redbud, flowering crabs and some tree lilacs.

I suggest you add Red Maple trees to your collection of flowering trees.  As soon as the buds swell in early spring, the flowers begin to develop that later become seeds.  Within 7 to 15 days after buds first swell the beautiful red flowers emerge.  Its EARLY spring flowering.

We may fail to recognize the beautiful red glow on the twigs of Red Maple trees as flowers, since they are not flowers like a flowering crab.  Individually, the flowers of a Red Maple tree are not stunning.  However, when the whole tree is covered by the lacy red pollinating and seed producing structures, the overall effect can be an impressive mass of glowing red covering almost every twig.

Some of the better Red Maple (acer rubrum) varieties for southern Minnesota are Red Sunset, Autumn Radiance, Autumn Spire and last, but not least, Redpointe®.  Redpointe®is a new rubrum maple released a few years ago and is rated zone 4b or 5a for cold hardiness.  Another nice feature of Redpointe® Red Maple is its ability to tolerate alkaline soil a little better than some red maple varieties.

Consider adding a new dimension of spring flowering color by placing a Red Maple tree in your landscape.  Red Maples add spring color, summer beauty, and brilliant red fall color, creating visual interest most of the year.

Heading off Heartbreak

OLYMPUS DIGITAL CAMERAIt can be heartbreaking to purchase, plant and nurture landscape trees only to see them severely damaged by mice, deer, rabbits and winter sunlight.  Every spring, many people call or stop by the nursery wanting to know what to do about tender tree bark that has been eaten, torn by deer antlers, or damaged by sunlight bouncing off winter snowbanks.  In many cases, it is simply too late.

The good news is that if you have young trees with bark that is undamaged, it is easy and inexpensive to protect them.  In late summer / early fall, simply apply a white plastic tree wrap over the trunk from ground level to a height of 3 to 4 feet.  I prefer 4 feet whenever possible.  Be sure to remove this plastic wrap in the spring once the grass greens up nicely.  It is important to use a white wrap to avoid temperature fluctuations.  Leaving tree wraps in place throughout the growing season is an invitation to damage from insects, bacteria and fungus.  Reinstall again as fall approaches.  Repeat until the trees are 5”-6” in diameter.

Tree wraps are inexpensive and they will last several years. They are available in several different styles / sizes which makes it easy to find one that best fits your tree.

 

 

November Tree Planting

Most years our crews do a number of tree planting projects from mid-November to late November or early December – and this year is no exception.   We have several hundred balled and burlapped and potted trees still available even after we have covered most of our other trees, shrubs and perennials.  As always – these late season plantings carry the Knecht’s Nurseries warranty, and our customers report that they have  very good results with late season plantings!

We do have limited hours now the last half of November so please give us a call at 507-645-5015 and we can discuss the details of late season tree planting and you can make sure someone is here when you would like to check out the availab le trees!

If you haven’t already protected the trunks on your young trees that you have planted this year or the last few years that are still susceptible to damage from hard frosts this winter or animal damage – we have several varieties of tree guards available for sale.  These will protect the trunks to help prevent frost cracking and keep the critters at bay from snacking on the bark during the winter.