The Complete Guide to Growing and Caring for Smooth Hydrangeas

Smooth Hydrangea: An Overview

If you're looking for a low-maintenance flowering shrub that can add some beautiful color to your garden, then look no further than smooth hydrangeas. These hardy plants are native to North America and are known for their large, showy blooms that come in shades of white, pink, and blue.

But what exactly are smooth hydrangeas? Also known as Hydrangea arborescens, smooth hydrangeas are a species of hydrangea that grow in USDA Hardiness Zones 3-9. They typically reach a height of 3-5 feet tall and wide, making them a great option for smaller gardens or as a border plant.

Now that you know a little bit about smooth hydrangeas, let's dive into how to grow and care for them.

Growing Smooth Hydrangeas

Here are the steps to follow when planting and growing smooth hydrangeas:

Step 1: Choose the Right Location

When selecting a spot to plant your smooth hydrangeas, it's important to choose an area with partial shade. Too much sun can cause the leaves to wilt, while too much shade can prevent the plant from producing flowers. Aim for a location where the plant will receive morning sun and afternoon shade.

Step 2: Prepare the Soil

Smooth hydrangeas prefer well-draining soil that is rich in organic matter. Before planting, amend the soil with compost or peat moss to improve its texture and fertility.

Step 3: Plant the Hydrangeas

Dig a hole that is two times wider than the size of the plant's root ball. Place the plant in the hole and backfill with soil, pressing down gently to eliminate any air pockets. Water the plant thoroughly.

Step 4: Water and Fertilize Regularly

Smooth hydrangeas require regular watering, especially during hot, dry weather. Aim for one inch of water per week. In addition, fertilize the plant once in the spring and again in midsummer with a balanced, slow-release fertilizer.

Caring for Smooth Hydrangeas

Once your smooth hydrangeas are planted and established, there are a few things you can do to ensure they thrive:

Prune Annually

In late winter or early spring, prune your smooth hydrangeas back to within 6-12 inches of the ground. This will encourage new growth and more vigorous blooms.

Mulch in the Spring

Apply a layer of organic mulch around the base of the plant in the spring to help retain moisture and discourage weeds.

Protect from Winter Weather

If you live in a colder climate, protect your smooth hydrangeas from harsh winter weather by covering them with burlap or another protective material.

Deadhead Spent Blooms

Remove spent blooms as soon as they fade to encourage the plant to produce more flowers.

Common Problems with Smooth Hydrangeas

While smooth hydrangeas are generally easy to care for, there are a few common problems you may encounter:

Leaf Spot

Leaf spot is a fungal disease that can cause brown spots on the leaves of your hydrangeas. To prevent this disease, avoid wetting the leaves when watering and ensure good air circulation around the plant.

Root Rot

Overwatering or poorly-draining soil can lead to root rot, which can cause the plant's leaves to turn yellow and fall off. To prevent root rot, ensure the soil is well-draining and don't water the plant too frequently.

Blooms Turning Brown

If your hydrangea blooms are turning brown, it may be due to hot, dry weather or too much sun exposure. Move the plant to a shadier location or provide some shade during the hottest part of the day.

FAQs about Smooth Hydrangeas

Q: When should I prune my smooth hydrangeas?

A: Prune your smooth hydrangeas in late winter or early spring, before new growth appears.

Q: How often should I water my smooth hydrangeas?

A: Aim for one inch of water per week, either from rainfall or irrigation.

Q: Can I grow smooth hydrangeas in containers?

A: Yes, you can grow smooth hydrangeas in containers as long as they are large enough to accommodate the plant's root system.

Q: How do I change the color of my smooth hydrangea blooms?

A: The color of smooth hydrangea blooms is determined by the pH level of the soil. If you want blue blooms, add aluminum sulfate to the soil. For pink blooms, add lime.

Q: When do smooth hydrangeas bloom?

A: Smooth hydrangeas typically bloom from late spring through early summer.

Smooth hydrangeas are a beautiful and easy-to-care-for addition to any garden. By following the steps outlined in this guide, you can ensure your plants thrive and produce plenty of colorful blooms throughout the growing season.