Step-by-Step Guide on Growing Hydrangeas Trees for Gorgeous Blooms

If you’ve ever dreamed of having a show-stopping garden, you’ve likely considered hydrangeas. These stunning shrubs and trees are loved for their large, colorful blooms that can turn any garden into a visual masterpiece.

While many hydrangeas are grown as bushes, the tree form (known as a “tree hydrangea”) is equally as breathtaking and adds an elegant, vertical element to your landscape.

If you’re eager to grow your own hydrangea tree, keep reading for a detailed guide on how to cultivate these beauties.

Why Choose Hydrangeas Tree?

Hydrangea trees, also called tree-like hydrangeas or “standard” hydrangeas, differ from the traditional bushy hydrangea variety.

They have a single trunk that supports large clusters of flowers at the top, which gives them the appearance of a small tree.

These trees can grow anywhere from 3 to 12 feet tall, depending on the variety, and bloom from late spring to early fall. Their unique, dramatic structure makes them an excellent focal point in a garden.

Step 1: Choosing the Right Variety

Some popular varieties include:

Hydrangea paniculata (Panicle Hydrangea): These hydrangeas are hardy and thrive in a variety of climates. They produce cone-shaped flowers that are white initially and turn pink or red as they age.
Hydrangea macrophylla (Bigleaf Hydrangea): Known for their large, rounded flowers that bloom in vibrant blues, pinks, or purples, depending on the soil pH. These require slightly more care to maintain their health, especially in colder climates.
Hydrangea arborescens (Smooth Hydrangea): A more compact variety, known for its white, fluffy blooms. This variety is very hardy and adapts well to various growing conditions.

Step 2: Choosing the Perfect Spot

Hydrangea trees thrive in locations with bright, indirect sunlight.

While they need some sunlight to produce those gorgeous blooms, direct sunlight, especially in the hotter months, can scorch their leaves and flowers. A partially shaded area, especially in the afternoon, is ideal.

You’ll also want to plant your hydrangea tree in well-drained soil that is rich in organic matter. It should not be too soggy, as hydrangeas don’t like “wet feet,” or the roots sitting in standing water.

If your soil tends to be heavy or clay-like, amend it with compost or well-rotted manure to improve drainage.

Step 3: Planting Your Hydrangea Tree

Hydrangea trees should be planted in spring or fall when the weather is mild and there’s plenty of time for the tree to establish itself before hot summer temperatures or cold winter conditions arrive.

Dig the Hole: Make the hole at least twice the size of the root ball of the hydrangea tree. The depth should match the root ball’s size so that the tree sits at the same level as it did in the pot.
Soil Preparation: Mix compost or organic matter with the existing soil. This will enrich the soil, providing the nutrients your hydrangea tree needs to grow strong and healthy.
Place the Tree: Gently remove the tree from its container and place it into the hole. Ensure that the root ball is level with the surrounding soil. Fill the hole back up with soil and gently firm it around the roots to eliminate air pockets.
Water Thoroughly: Once planted, water the hydrangea deeply. Hydrangeas like moisture, so ensure the soil is evenly moist but not soggy.

Step 4: Care and Maintenance

Hydrangea trees are relatively low-maintenance but will thrive with proper care. Here’s what you’ll need to focus on throughout the year:

Watering: Hydrangeas need consistent moisture to flourish. Water deeply when the top inch of soil feels dry, especially during dry spells. Mulching around the base will help retain moisture in the soil and keep the roots cool.
Pruning: Pruning hydrangea trees is essential for maintaining their shape and encouraging more blooms. The best time to prune is after they have finished flowering, typically in late fall or early spring. Trim dead or damaged wood, and cut back the branches to maintain the tree’s shape.
Tip: For panicle hydrangeas, prune them back by one-third to promote a fuller bloom. For smooth hydrangeas, you can cut them back to about 6 inches above the ground in early spring.
Fertilizing: Fertilize your hydrangea tree once in early spring with a balanced fertilizer to encourage healthy growth. A slow-release fertilizer with equal parts nitrogen, phosphorus, and potassium will work best.
Mulching: Apply a 2-3 inch layer of mulch around the base of the tree to retain moisture and suppress weeds. This will also protect the roots during winter, especially in colder climates.

Step 5: Preventing Common Problems

Hydrangeas are relatively pest and disease-resistant, but they can still face a few issues. Here are some common problems to watch out for:

Leaf Spot: This fungal disease causes dark spots on the leaves. To prevent it, avoid overhead watering, which can splash water on the leaves. Remove any infected leaves and dispose of them properly.
Aphids: These tiny insects suck the sap from your hydrangea tree, leading to curled, yellowing leaves. Use insecticidal soap or a strong stream of water to wash aphids off the plant.
Mildew: Powdery mildew can affect the leaves, causing a white, powdery coating. Ensure proper air circulation around the plant, and remove any infected leaves. Fungicides can also be used if necessary.