In this blog, we’ll explore:
- Different
types of evergreens and their uses
- General
maintenance and care
- Common
pests and diseases
Let’s dive in and learn how to keep these remarkable trees
thriving!
Popular Types of Evergreens
There are a significant number of types of evergreens you
can choose from. Here in North America or in other temperate areas of the
world, when someone mentions evergreens, we often think of conifers. These
conifers can range from towering trees to low-growing shrubs.
Here are a few types of conifers that are most common and
popular:
Pines: Known for their needle-like leaves and resilience, pines are popular for windbreaks and erosion control. Their height and dense foliage also make them excellent privacy screens.
Spruces: With their symmetrical shape and rich green needles, spruces are favorites in ornamental landscaping and holiday traditions.
Junipers: These hardy evergreens are perfect for ground cover or low-maintenance borders, thriving in various conditions.
Firs: Often associated with Christmas trees, firs are prized for their soft needles and aromatic qualities.
Cedars: Valued for their fragrant wood, cedars are ideal for hedges and creating natural fences.
Whether used for aesthetics, function, or tradition,
evergreens are indispensable in enhancing landscapes and supporting wildlife
habitats.
General Maintenance and Care
While most evergreens will grow in poor soil conditions and
harsh climates, it doesn’t mean we can totally neglect them in our yards or
landscaping if we want them to thrive.
If you’re planting a new tree in your yard or garden, make
sure it’s in the best location. Evergreens need good draining soil, as any
standing water may cause root rot. Also consider the eventual size and shape of
the tree so it has enough room and sunshine as it grows.
For established trees, you want to ensure they are getting
watered. Give them a long, deep soak if you have been experiencing dry spells
recently. A layer of mulch around the base helps retain soil moisture, regulate
temperature, and reduce any weeds that can outcompete for nutrients.
Pruning is another important task. Remove dead or damaged
branches to promote healthy growth. You can also trim for shape or size if the
tree is overcrowding other plants, but be sure to prune in late winter or early
spring before new growth starts.
With these simple steps, you can ensure your evergreens
remain a lasting, healthy part of your landscape.
Common Evergreen Pests
Luckily, evergreens are pretty hardy trees and they can hold
up against most pests and diseases. However, if they are stressed or weakened,
an insect or fungus could kill them under the right conditions.
Here are a few common insect pests to be on the look for and
how to treat them:
Bark Beetles: These tiny insects bore into the bark,
leaving small holes and sawdust-like frass. They can cause dieback or even kill
the tree. Bark Beetle
Spider Mites: These pests feed on needles, causing
them to discolor and drop prematurely. Look for fine webbing as a sign of
infestation.
Bagworms: These caterpillars create protective bags
and feed on needles, leading to defoliation. It’s best to cut off individual
bags with scissors and dispose of them. If you try spraying for them, use products containing Bacillus thuringiensis kurstaki (Btk) in June and July when the bags are small. Bagworm Cocoon
Scale Insects: They appear as small bumps on needles
or branches and suck sap, weakening the tree. Fortunately, these insects aren’t
a huge problem for most evergreens, but they can be a problem for new saplings
or nursery stock.
Sawflies: These caterpillar-like pests are actually
wasps. They tend to feed on needles in groups and clusters, shaking their
bodies when they are disturbed.
Hemlock Woolly Adelgid
Adelgids: These insects look like aphids, but are
covered in a waxy layer. They feed at the base of needles and can cause galls.
It’s best to spray for them in the spring.
Now let’s look at some common diseases and ways to treat
your trees:
Crown and Root Rot: This is caused by poor drainage
and several species of root rot fungi or root molds may be the cause. It’s best
to reduce soil moisture and increase drainage around the tree. Too much mulch
can also be the problem.
Rhizosphaera needle cast: This is an issue for
Colorado blue spruce trees and can make the needles turn purple or brown. Use
fungicides on the tree or products containing copper or chlorothalonil. This
can help prevent the spread of the fungus.
Cytospora Canker: This fungal disease creates sunken,
discolored areas on branches, often exuding resin. If you find this fungus on
your evergreens, prune infested limbs, and destroy them. Remember to disinfect
your pruners in between each cut
Gymnosporangium Rust: Causes bright orange spots on
needles and gelatinous orange spore masses on branches during wet spring
conditions, especially on junipers and cedars. Prune infected branches, improve
air circulation, and use fungicides in late winter or early spring to prevent
spread.
Tip Blight: Tip blight causes the browning of new growth and small black fungal fruiting bodies on affected needles, often in stressed or mature pines and spruces. Prune off infected branches and apply fungicides in the early growing season.
Evergreens are remarkable trees that offer beauty, function,
and resilience in a variety of landscapes. While they can thrive in challenging
conditions, a little care goes a long way in keeping them healthy.
By selecting the right evergreen for your space, maintaining
proper watering and pruning routines, and staying vigilant for pests and
diseases, you can ensure these trees continue to flourish for years to come.
Whether providing privacy, enhancing wildlife habitats, or simply adding year-round greenery, evergreens are a valuable addition to any yard or garden.
- Grant @ ARBICO Organics