Blue Spruce Care Guide

Blue Spruce is a fantastic plant primarily because of its blue needles. Very few plants have such colors. In this article, you will learn everything you need to know about this plant.

Plant profile

Planting

A place with a few hours of direct sunlight and drained soil is ideal for planting Blue Spruce. Also, there should be a few feet of space around the tree for good air movement.

It is best to plant or transplant Blue Spruce in March. It would be best to plant this tree before the beginning of the growing season, in which case you can count on an almost 100 percent rooting rate. The second suitable period is the end of September.

Blue Spruce should be planted at least 15 feet apart from other trees or buildings. If you plant it too close, you might have problems with disease or needle color.

The planting hole should be at least twice the size of the spruce root ball. First, fill it with partially prepared soil, which we will discuss later. Then place the tree so that the place where the trunk meets the roots is not submerged in the soil. After planting, water the spruce with plenty of water.

Read more: How Do You Plant A Blue Spruce Tree?

Light requirements

Blue Spruce needs at least 5-6 hours of direct sunlight daily. You will get a tree with a dense crown and blue needles in this case.

Also, Blue Spruce can easily tolerate full sun. It can get direct sunlight all day long, and nothing bad will happen to it. Moreover, in the full sun, its needles will be even bluer.

Placing Blue Spruce in full shade is contraindicated to it. Even dappled sun is not suitable for this tree. If it does not have access to the direct sun, the crown will not be lush, and the needles will be greenish. After a few years spent in the shade, the spruce will die.

Read more: How Much Sun Does A Blue Spruce Tree Need?

Soil

Blue Spruce tolerates a wide range of soils. If you have clay soil, add organic matter to the planting hole to improve it.

Adding organic matter is also positive for sandy soil as it will make the soil slightly moist, and you will not have to water the spruce too often.

As for soil acidity, Blue Spruce likes soil pH 6.0-7.0. This tree grows well in neutral or slightly acidic soil. It can also tolerate highly acidic and alkaline soil, but in this case, the growth will not be as vigorous as it could be.

Read more: What Kind Of Soil Does Blue Spruce Like?

Watering

Water Blue Spruce as soon as the soil dries out 2 inches. Such watering is necessary before the tree is fully rooted. The rooting process can take one to two years. If the year after planting, the spruce has made good growth, you can consider it rooted.

Fully rooted spruce does not need watering at all. Exceptions are periods of extreme drought.

The amount of water should be at least 1-2 gallons. Water should reach all the roots of the tree. You can water in two stages, first soaking the top layer and then watering again to soak up the water to the maximum depth.

Avoid watering too often, as Blue Spruce can get root rot. Constantly wet soil will cause the roots to become soft and begin to rot.

Read more: How Often Should You Water A Blue Spruce?

Pruning

Blue Spruce is a semi-dwarf spruce, so it does not need pruning. But if you want to make it even more compact, you can trim it. The best time for pruning is in the second half of spring or early summer.

Sanitary pruning can be done in the fall or early spring. Removing dead branches is good practice from a plant health standpoint.

Always use sterile tools, sharpening them beforehand. After pruning, spraying the spruce with a fungicide is a good idea to prevent fungal infestations.

Read more: How Do You Prune A Blue Spruce Tree?

Diseases

One of the reasons why Blue Spruce dies is root rot. The symptoms of this disease are the needles turning brown and then falling off. Remove all excess water near the spruce (frequent watering, high groundwater, etc.) to fix this. There is nothing else you can do, if the tree is strong it will beat the disease on its own.

One of the most common problems with Blue Spruce is a fungal disease. This is especially true in an area with high humidity. Symptoms of fungal disease are black spots on the needles and yellowing and falling off.

To cure the disease, ensure good air exchange around the spruce. Clean all dead needles and branches. Spray the spruce with an aqueous solution of copper-based fungicide. Repeat the spraying in a few weeks.

Read more: Why Are My Blue Spruce Trees Turning Brown?

Pests

One of the most common Blue Spruce pests is the Yellow-headed Spruce Sawfly. These insects have long, narrow bodies and long wings. They can travel considerable distances and infest a variety of spruce species.

The female lays eggs on spruce branches in the spring. When the larva hatches, it feeds on young, soft needles. A few dozen grubs can do a lot of damage to a spruce tree and make it look ugly.

To get rid of these pests, wash off the larvae with water and crush them. Next, spray the Blue Spruce with horticultural oil or neem oil. This will prevent new eggs from hatching and kill the larvae.

If nothing works, use a systemic insecticide several times at 2-week intervals. Although toxic, it is very effective.

Read more: How Do You Treat Blue Spruce Bagworms?

Fertilizer

A multi-purpose balanced fertilizer is best for Blue Spruce. Make sure the fertilizer is made into slow-release pellets. Apply it once a year in early spring before the buds begin to push. That’s it; now the tree has everything it needs for the whole season.

Avoid frequent applications, as this can damage the root system. In this case, the needles will turn brown. Also, do not fertilize spruce for the winter as this can cause the tree to grow, and frost will damage the young branches.

Another thing you can do is mulch your spruce with compost. Compost is a good organic fertilizer that protects the roots from overheating and rapid soil drying. Make sure the layer of compost is no more than 2 inches thick, and there is at least a 1-inch gap between the trunk and the mulch.

Read more: What Is The Best Fertilizer For Blue Spruce Trees?

Propagation

If we discuss propagating a variety, the only effective way to propagate Blue Spruce is by grafting. This way, you can get an exact copy of the mother plant, i.e., all the varietal characteristics will be fully transferred to the new plant.

It is also possible to propagate Blue Spruce by cuttings, but the number of rooted cuttings will be less than 10%. For this reason, this method is not commercially viable.

And the third way of propagation is by seeds. This way you will not get plants with varietal characteristics. Most of the seedlings will be green just like in the forest.

Transplanting

The best time to transplant a Blue Spruce is late February or early March, depending on the climate in which you live. It would be best to wait until the soil had thawed, but the buds had not started pushing.

A few days before moving, water the Blue Spruce with 2 gallons of water.

Choose a cloudy day, as the plant can lose a lot of water in sunny weather. For the same reason, transplant in the morning or evening but not in the middle of the day.

Dig up the spruce as gently as possible. The fewer roots you damage, the easier it will be for the plant to survive the transplanting.

Gently move the spruce to its new location. Dig a hole twice as big as the roots. Fill it partially with a mixture of native soil and soil conditioner.

Place the Blue Spruce in the hole so only the roots are buried. The trunk should remain above the ground. Fill all the space in the hole with the soil mix and water with 2-3 gallons of water.

Read more: How Do You Transplant A Blue Spruce?

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