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ProGreen 2026
Planting season has arrived at last!
By Chris Leinster - February 6, 2026
The 2026 ProGreen Expo has concluded, and this means that the planting season for the new year is officially underway! ProGreen is the premier regional green industry trade show at the Colorado Convention Center. Businesses that serve all aspects of the landscape industry showcase vehicles and equipment, chemicals and fertilizers, soil and stone products, technology and business services, and of course, trees and all sorts of plant material. ProGreen offers a great way for leaders in the landscape industry to reconnect after the winter break, keep up to date with new products and best practices, and most importantly for Happy Trees, to receive updated catalogs and pricing from all our local vendors.
I am vigorously updating our tree library online and loading prices for 2026 on our website. So far, we’re seeing only modest price increases from last year. This is a welcome reprieve, as a national tree shortage and skyrocketing labor and fuel prices have led to jarring increases over the past couple of years. This is great news, and seems to be relevant across most suppliers and vendors. I am evaluating to make sure Happy Trees is offering the highest value in tree planting services at a competitive price.
The most prevalent topic on everyone’s mind is naturally the weather. It has been an extraordinarily warm and historically dry winter across the Front Range. Local growers are considering harvesting trees several weeks earlier than usual. Happy Trees may have new stock and fresh material for those wanting to get a jump on the planting season! Others prognosticate winter’s late arrival, meaning wet weather may delay spring planting once winter finally decides to show up. Happy Trees will be nimble and ready to respond to whatever the weather throws at us!
Meanwhile, homeowners should be dragging out the hoses and giving everything a good drink. Daytime temperatures are in the 60’s and will be for the next few days. Dry ground is stressful on plants, and can actually suck the water out of tree and shrub roots! Turn your hose down to a trickle and set it at the base of newly planted trees for 5-10 minutes, or use a broadcast type sprinkler like a “Frog Eye” to water a wider area for 15-30 minutes for more established trees. Your lawn could use a drink too. Although most plants are technically dormant, everything will benefit from some moisture in the soil.
Hopefully I’ll get a few more ski days in before the phones start ringing off the hook. If you’re looking to have trees installed this spring go ahead and give us a call and we’ll get you to the front of the queue.
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I am vigorously updating our tree library online and loading prices for 2026 on our website. So far, we’re seeing only modest price increases from last year. This is a welcome reprieve, as a national tree shortage and skyrocketing labor and fuel prices have led to jarring increases over the past couple of years. This is great news, and seems to be relevant across most suppliers and vendors. I am evaluating to make sure Happy Trees is offering the highest value in tree planting services at a competitive price.
The most prevalent topic on everyone’s mind is naturally the weather. It has been an extraordinarily warm and historically dry winter across the Front Range. Local growers are considering harvesting trees several weeks earlier than usual. Happy Trees may have new stock and fresh material for those wanting to get a jump on the planting season! Others prognosticate winter’s late arrival, meaning wet weather may delay spring planting once winter finally decides to show up. Happy Trees will be nimble and ready to respond to whatever the weather throws at us!
Meanwhile, homeowners should be dragging out the hoses and giving everything a good drink. Daytime temperatures are in the 60’s and will be for the next few days. Dry ground is stressful on plants, and can actually suck the water out of tree and shrub roots! Turn your hose down to a trickle and set it at the base of newly planted trees for 5-10 minutes, or use a broadcast type sprinkler like a “Frog Eye” to water a wider area for 15-30 minutes for more established trees. Your lawn could use a drink too. Although most plants are technically dormant, everything will benefit from some moisture in the soil.
Hopefully I’ll get a few more ski days in before the phones start ringing off the hook. If you’re looking to have trees installed this spring go ahead and give us a call and we’ll get you to the front of the queue.
We're in the sweet spot!
Schedule your fall planting today!
By Chris Leinster - September 23, 2025
It was a brutally hot summer with wildfire smoke blanketing the Front Range for much of July and August. While Happy Trees planted nearly every day with extraordinary success, cooler temperatures and natural precipitation provide better conditions for planting trees. If you were waiting for Fall to get trees in the ground, Fall has arrived and now is a great time to plant!
Trees can only be successfully harvested while the trees are dormant, usually in February and March, and again in September, October, and November. Every tree that was sold over the summer months was dug in late winter/ early spring. True, supplies for many trees are somewhat or totally depleted by this time of year, but most wholesalers anticipate this and order quantities of the most popular trees sufficient to meet fall demand.
If you’re looking for Maple, Autumn Blaze remains one of the best sellers around the region. While Autumn Blaze is a perfectly acceptable tree for Colorado, they are exhibiting summer stress from sitting in the nursery through the heat of summer. This manifests by turning early fall color, and sun-scorched leaf margins. The trees will recover beautifully if planted in your yard, but more resilient varieties of maple with very similar characteristics are coming online in recent years. It should be noted that Autumn Blaze is the only variety that is seedless, so I still recommend them if this is important to you.
Consider Redpointe Maple, virtually the same as Autumn Blaze, but with a more uniform branch structure, a dominant central leader, and better adapted to deal with our drought and alkaline soil. While I do observe some summer stress, they are faring much better than their AB cousins at the end of the season. Also noteworthy, Fall Fiesta Maple is a magnificent choice for our harsh environment. Still a quick maturing overstory shade tree, Fall Fiesta exhibits a diverse display of Red-Orange-Yellow fall foliage. If you need a more bomb proof plant for exposed sites or urban areas, State Street Maple is tough to beat. These are stout trees that are quite adaptable to our alkaline soils, they withstand our dramatic temperature swings, and are resistant to frost cracking. These stalwart trees are showing no signs of summer distress and are among the best looking trees in the nursery at this time. Brilliant Gold fall color, a great addition to any yard.
If you don’t mind acorns, I’ve still got plenty of Oak from which to choose. Northern Red, Shumard, and Texas Red are abundant in both 2” and 2-1/2” caliper sizes. If the beans don’t bother you, I’ve got some of the best Western Catalpa I’ve ever seen on the lot! One of my vendors has Redmond Linden newly arrived in 2-1/2” that I could probably sell as 3”, an exceptional value! Skyline Honeylocust are plentiful in all sizes, one of our cleaner trees for shading decks and patios.
Fall harvested trees are beginning to arrive from our northern states and Canada. Spruce, Austrian Pine, and Pinion Pine are now arriving daily. The pickings were getting pretty slim on these popular evergreens, but if you act now you’ll get the pick of the litter!
It’s been another sensational year for Happy Trees, with hundreds of newly planted trees now gracing the homes and yards of Coloradoans! If you’re considering a fall planting, it’s time to pick up the phone. Remember, it may take a few weeks for HOA approval if necessary, and a week for utility locates. We generally plant straight through October, although last year temperatures remained favorable for the better part of November which extended our planting season. The cover photo was taken 9/30 in the Mt. Evans wilderness. Aspen are displaying peak fall color, so hurry up and get scheduled today!
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Trees can only be successfully harvested while the trees are dormant, usually in February and March, and again in September, October, and November. Every tree that was sold over the summer months was dug in late winter/ early spring. True, supplies for many trees are somewhat or totally depleted by this time of year, but most wholesalers anticipate this and order quantities of the most popular trees sufficient to meet fall demand.
If you’re looking for Maple, Autumn Blaze remains one of the best sellers around the region. While Autumn Blaze is a perfectly acceptable tree for Colorado, they are exhibiting summer stress from sitting in the nursery through the heat of summer. This manifests by turning early fall color, and sun-scorched leaf margins. The trees will recover beautifully if planted in your yard, but more resilient varieties of maple with very similar characteristics are coming online in recent years. It should be noted that Autumn Blaze is the only variety that is seedless, so I still recommend them if this is important to you.
Consider Redpointe Maple, virtually the same as Autumn Blaze, but with a more uniform branch structure, a dominant central leader, and better adapted to deal with our drought and alkaline soil. While I do observe some summer stress, they are faring much better than their AB cousins at the end of the season. Also noteworthy, Fall Fiesta Maple is a magnificent choice for our harsh environment. Still a quick maturing overstory shade tree, Fall Fiesta exhibits a diverse display of Red-Orange-Yellow fall foliage. If you need a more bomb proof plant for exposed sites or urban areas, State Street Maple is tough to beat. These are stout trees that are quite adaptable to our alkaline soils, they withstand our dramatic temperature swings, and are resistant to frost cracking. These stalwart trees are showing no signs of summer distress and are among the best looking trees in the nursery at this time. Brilliant Gold fall color, a great addition to any yard.
If you don’t mind acorns, I’ve still got plenty of Oak from which to choose. Northern Red, Shumard, and Texas Red are abundant in both 2” and 2-1/2” caliper sizes. If the beans don’t bother you, I’ve got some of the best Western Catalpa I’ve ever seen on the lot! One of my vendors has Redmond Linden newly arrived in 2-1/2” that I could probably sell as 3”, an exceptional value! Skyline Honeylocust are plentiful in all sizes, one of our cleaner trees for shading decks and patios.
Fall harvested trees are beginning to arrive from our northern states and Canada. Spruce, Austrian Pine, and Pinion Pine are now arriving daily. The pickings were getting pretty slim on these popular evergreens, but if you act now you’ll get the pick of the litter!
It’s been another sensational year for Happy Trees, with hundreds of newly planted trees now gracing the homes and yards of Coloradoans! If you’re considering a fall planting, it’s time to pick up the phone. Remember, it may take a few weeks for HOA approval if necessary, and a week for utility locates. We generally plant straight through October, although last year temperatures remained favorable for the better part of November which extended our planting season. The cover photo was taken 9/30 in the Mt. Evans wilderness. Aspen are displaying peak fall color, so hurry up and get scheduled today!
Genetic Regression
What is going on with this unusual shrub?
By Chris Leinster - September 10, 2025
The accompanying photo perfectly demonstrates an example of Genetic Regression. Genetic Regression occurs when a genetic mutation of a hybridized plant “regresses” back to it’s ancestral form. In this instance, a Dwarf Alberta Spruce, which itself is a genetic mutation of a White Spruce, regressed back to its original form!
All Dwarf Alberta Spruce are clones of mutated branches, often called “witches brooms”, originally found growing in an isolated stand of White Spruce in Alberta, Canada. Botanists took cuttings of the mutated branches, grafted them to a common Spruce root stock, and propagated the miniature, slow-growing, conical ornamental shrubs we now enjoy as Dwarf Alberta Spruce.
For reasons that are not fully understood, and reasons that are irrelevant for this discussion, select cells at the top of this shrub reverted back to the parent White Spruce heritage. While this looks kind of cool, it is usually undesirable. The White Spruce is growing much faster and larger than intended by the design requirements and will continue to do so until it overtakes and eventually kills the host Dwarf Spruce.
Genetic Regression is quite common in many types of variegated plants, plants hybridized and selected for variable or striated colors in the leaves. For example, Emerald Gaiety and Emerald ‘n Gold Euonymus have been selected because they have white and gold margins around a green leaf. Often times, a branch or several branches will regress, displaying only green leaves, usually with more aggressive growth. Ivory Halo Dogwood, Tricolor Beech, and Purple Smoketree are susceptible to regression as well.
The remedy is quite simple. Simply prune or trim off the affected branches as soon as the anomaly is detected. Easy! The sooner the better, as the abnormality can swiftly take over and wreck the integrity of the desired traits of the plant, as the cover photo can attest.
Read More...
All Dwarf Alberta Spruce are clones of mutated branches, often called “witches brooms”, originally found growing in an isolated stand of White Spruce in Alberta, Canada. Botanists took cuttings of the mutated branches, grafted them to a common Spruce root stock, and propagated the miniature, slow-growing, conical ornamental shrubs we now enjoy as Dwarf Alberta Spruce.
For reasons that are not fully understood, and reasons that are irrelevant for this discussion, select cells at the top of this shrub reverted back to the parent White Spruce heritage. While this looks kind of cool, it is usually undesirable. The White Spruce is growing much faster and larger than intended by the design requirements and will continue to do so until it overtakes and eventually kills the host Dwarf Spruce.
Genetic Regression is quite common in many types of variegated plants, plants hybridized and selected for variable or striated colors in the leaves. For example, Emerald Gaiety and Emerald ‘n Gold Euonymus have been selected because they have white and gold margins around a green leaf. Often times, a branch or several branches will regress, displaying only green leaves, usually with more aggressive growth. Ivory Halo Dogwood, Tricolor Beech, and Purple Smoketree are susceptible to regression as well.
The remedy is quite simple. Simply prune or trim off the affected branches as soon as the anomaly is detected. Easy! The sooner the better, as the abnormality can swiftly take over and wreck the integrity of the desired traits of the plant, as the cover photo can attest.
Colorado Native Quaking Aspen
Native! So a great choice for my yard, right?
By Chris Leinster - August 11, 2025
Head west to any High Country destination in Colorado and you’ll surely pass through or arrive at a magical forest of Aspen trees. With their towering bleached white trunks, densely packed stands, and trembling leaves that flutter in the breeze, a walk through an Aspen forest is a truly enchanting experience! Spend enough time lingering among these quaking giants and you will likely encounter deer, elk, or moose that feast voraciously on the tender leaves.
As you cruise west on I-70 you may notice that south facing hillsides on your right are rather barren, hosting mostly grasses and the stray Ponderosa Pine, Pinion Pine, or Rocky Mountain Juniper. To your left, slopes are more lushly decorated with Spruce, Fir, and Aspen…lots and lots of Aspen! North facing slopes shade themselves, so they tend to be cooler and they retain more water. This is where Aspen thrive, particularly along valley floors along stream banks where soil moisture and humidity are abundant.
So they grow well in Colorado and therefore should be an excellent addition to our yard in the Front Range, right? Not so much. As previously mentioned, they prefer higher elevations and cooler temperatures. East of the Hogback the sun bakes barren soil, much like the south facing slopes of our mountain passes where Aspen are rarely found. Even with ample irrigation, the dry air of Eastern Colorado stresses Aspen through the long, hot days of Summer. I like to say that I love Aspen…in Aspen. Down here they struggle, and weak trees become susceptible to various bacterial diseases and leaf blights.
As you gaze upon a grove of Aspen Trees in the mountains, you are likely looking at a single Aspen tree with multiple trunks! Did you know that Aspen colonize by sending up trees from sprawling root systems? Technically a single tree even though you see dozens or even hundreds of seemingly independent trees. In fact, an Aspen grove spanning over one hundred acres in Utah, named “The Pando Tree”, is considered the largest single living organism on earth!
This information is useful on trivia night, but it also means that Aspen often send up trees in your lawn, gardens, your neighbor’s lawn, and generally anywhere you didn’t intend to plant a tree. The surface roots can tear up your grass, much like their close cousins the Cottonwood. And like Cottonwood, they have cottony seeds that can clutter up the garden and can also sprout trees. These attributes make them less than desirable trees for most residential gardens along the Front Range.
Even if you can get them to grow successfully, Aspen tend to be short lived down here, usually expiring within 15-20 years. I see Aspen in various stages of decline whenever I drive through a mature neighborhood. Still, if you need a quick screen and intend to be in the house for only a few years Aspen might be suitable for your needs. I don’t feature Aspen on my website so if you insist on Aspen call or email for availability and pricing. The best way to appreciate Aspen is by blasting turns on a powder day through a north facing Aspen glade at Steamboat, Beaver Creek, or, naturally, Aspen!
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As you cruise west on I-70 you may notice that south facing hillsides on your right are rather barren, hosting mostly grasses and the stray Ponderosa Pine, Pinion Pine, or Rocky Mountain Juniper. To your left, slopes are more lushly decorated with Spruce, Fir, and Aspen…lots and lots of Aspen! North facing slopes shade themselves, so they tend to be cooler and they retain more water. This is where Aspen thrive, particularly along valley floors along stream banks where soil moisture and humidity are abundant.
So they grow well in Colorado and therefore should be an excellent addition to our yard in the Front Range, right? Not so much. As previously mentioned, they prefer higher elevations and cooler temperatures. East of the Hogback the sun bakes barren soil, much like the south facing slopes of our mountain passes where Aspen are rarely found. Even with ample irrigation, the dry air of Eastern Colorado stresses Aspen through the long, hot days of Summer. I like to say that I love Aspen…in Aspen. Down here they struggle, and weak trees become susceptible to various bacterial diseases and leaf blights.
As you gaze upon a grove of Aspen Trees in the mountains, you are likely looking at a single Aspen tree with multiple trunks! Did you know that Aspen colonize by sending up trees from sprawling root systems? Technically a single tree even though you see dozens or even hundreds of seemingly independent trees. In fact, an Aspen grove spanning over one hundred acres in Utah, named “The Pando Tree”, is considered the largest single living organism on earth!
This information is useful on trivia night, but it also means that Aspen often send up trees in your lawn, gardens, your neighbor’s lawn, and generally anywhere you didn’t intend to plant a tree. The surface roots can tear up your grass, much like their close cousins the Cottonwood. And like Cottonwood, they have cottony seeds that can clutter up the garden and can also sprout trees. These attributes make them less than desirable trees for most residential gardens along the Front Range.
Even if you can get them to grow successfully, Aspen tend to be short lived down here, usually expiring within 15-20 years. I see Aspen in various stages of decline whenever I drive through a mature neighborhood. Still, if you need a quick screen and intend to be in the house for only a few years Aspen might be suitable for your needs. I don’t feature Aspen on my website so if you insist on Aspen call or email for availability and pricing. The best way to appreciate Aspen is by blasting turns on a powder day through a north facing Aspen glade at Steamboat, Beaver Creek, or, naturally, Aspen!
To plant or not to plant?
The Mighty Cottonwood!
By Chris Leinster - July 13, 2025
Cottonwood are on the very short list of Shade trees native to the Front Range and Colorado’s Eastern Plains. Always found growing in lowland areas along stream banks and river beds, or in dry arroyos where they receive seasonal water. They are close cousins of Aspen in the Poplar family of trees, and share many of the same characteristics, such as fast growth and adaptability. Cottonwood grow much larger though, soaring up to 100’ and just as wide! I’ve seen ancient Cottonwood with massive trunks at least 10 in diameter.
So should you plant one? Probably not. Cottonwood shed cotton. Lots of cotton, hence the name. The cotton carries seeds adrift on the wind where they can colonize anywhere they find water. Or the cotton covers your patio furniture and clogs your air conditioner. For that reason alone, many homeowners avoid them. There are, however, cotton-less varieties available, so perhaps a better choice if you need Cottonwood. There are other problems to consider as well.
Cottonwood are shallow rooted, meaning they will spread surface level roots across your lawn in search of water. These roots often break the surface, creating ankle biter obstacles sure to ruin your frisbee game. Roots can spread as wide as the tree canopy, taking over the yards of most suburban properties. Cottonwood are also twiggy, and constantly shed their branches throughout the Summer. You’ll be picking up sticks and twigs after every gusty storm.
If you have a rural property in the Foothills or Eastern Plains, or are planting in a meadow or prairie, or perhaps in a neighborhood common area, Cottonwood may be an acceptable choice. They are quite drought hardy once established. They grow incredibly quickly and provide broad shade. They provide a sanctuary for wildlife. They are salad to deer and elk though, so consider deer fencing or deterrents if planting in habitat. They are quite picturesque as well. Walk into any art gallery and you’ll likely see pictures or paintings of massive Cottonwood trees lording over abandoned farms.
While Cottonwood are probably not likely candidates for most suburban landscapes and lawns, Native trees should always be considered where space and aesthetics allow. They are an excellent choices for mountain communities and can be found growing up to 9,500’. We don’t feature Cottonwood on our website, so please call for availability and pricing.
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So should you plant one? Probably not. Cottonwood shed cotton. Lots of cotton, hence the name. The cotton carries seeds adrift on the wind where they can colonize anywhere they find water. Or the cotton covers your patio furniture and clogs your air conditioner. For that reason alone, many homeowners avoid them. There are, however, cotton-less varieties available, so perhaps a better choice if you need Cottonwood. There are other problems to consider as well.
Cottonwood are shallow rooted, meaning they will spread surface level roots across your lawn in search of water. These roots often break the surface, creating ankle biter obstacles sure to ruin your frisbee game. Roots can spread as wide as the tree canopy, taking over the yards of most suburban properties. Cottonwood are also twiggy, and constantly shed their branches throughout the Summer. You’ll be picking up sticks and twigs after every gusty storm.
If you have a rural property in the Foothills or Eastern Plains, or are planting in a meadow or prairie, or perhaps in a neighborhood common area, Cottonwood may be an acceptable choice. They are quite drought hardy once established. They grow incredibly quickly and provide broad shade. They provide a sanctuary for wildlife. They are salad to deer and elk though, so consider deer fencing or deterrents if planting in habitat. They are quite picturesque as well. Walk into any art gallery and you’ll likely see pictures or paintings of massive Cottonwood trees lording over abandoned farms.
While Cottonwood are probably not likely candidates for most suburban landscapes and lawns, Native trees should always be considered where space and aesthetics allow. They are an excellent choices for mountain communities and can be found growing up to 9,500’. We don’t feature Cottonwood on our website, so please call for availability and pricing.
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