Planting Big Leaf Hydrangeas: A Complete Guide

Big Leaf Hydrangeas: An Overview

Are you planning to plant big leaf hydrangeas in your garden? If yes, then this article is for you. Big leaf hydrangeas, also known as Hydrangea macrophylla, are popular ornamental plants that come in a wide range of colors and sizes. They are native to Japan and Korea and are grown for their large, showy blooms. In this comprehensive guide, we will take you through all the steps involved in planting big leaf hydrangeas, from choosing the right location to caring for them after planting.

Choosing the Right Location

The first step in planting big leaf hydrangeas is to choose the right location. These plants prefer partial shade, so look for an area that gets morning sun and afternoon shade. Avoid areas with full sun exposure, as it can cause the leaves to wilt and the flowers to fade quickly. Also, make sure the soil is well-draining, rich in organic matter, and slightly acidic with a pH between 5.5 and 6.5.

Soil Preparation

Before planting, it is essential to prepare the soil properly. by removing any weeds or grass from the planting area. Then, dig a hole that is twice as wide and just as deep as the root ball of your hydrangea plant. Mix some compost or well-rotted manure into the soil to improve its fertility and drainage. You can also add some peat moss or sulfur if your soil is alkaline.

Planting

Once the soil is ready, it's time to plant your big leaf hydrangea. Gently remove the plant from its container and loosen the roots with your fingers. Place the root ball in the center of the planting hole and backfill with soil. Make sure that the top of the root ball is level with the surrounding soil. Water thoroughly to settle the soil around the roots.

Watering

Big leaf hydrangeas need regular watering to thrive. Water deeply once a week, especially during hot, dry weather. However, avoid overwatering, as it can lead to root rot and other fungal diseases. Mulching around the base of the plant with organic material like shredded bark or leaves can help retain moisture and suppress weeds.

Fertilizing

Fertilizing is essential for the growth and blooming of big leaf hydrangeas. Apply a balanced fertilizer with an NPK ratio of 10-10-10 or 12-4-8 in early spring before new growth begins. You can also use a slow-release fertilizer that will feed the plant throughout the growing season. Avoid fertilizing after mid-summer, as it can stimulate new growth that may not have enough time to harden off before winter.

Pruning

Pruning is necessary to maintain the size and shape of big leaf hydrangeas. It is best to prune them in late winter or early spring before new growth appears. Remove any dead, damaged, or diseased branches first. Then, trim back the previous year's growth by one-third to two-thirds, leaving only two or three buds per stem. This will encourage the growth of new shoots and more abundant blooms.

Pests and Diseases

Big leaf hydrangeas are susceptible to several pests and diseases that can affect their health and appearance. Here are some common problems to watch out for:

Leaf Spot

Leaf spot is a fungal disease that causes brown or black spots on the leaves. It can be prevented by keeping the foliage dry and avoiding overhead watering.

Powdery Mildew

Powdery mildew is a white, powdery coating that appears on the leaves and flowers of hydrangeas. It can be controlled by improving air circulation and reducing humidity.

Aphids

Aphids are small, soft-bodied insects that suck sap from the leaves and stems of plants. They can be controlled by spraying the plant with a strong jet of water or applying insecticidal soap.

Propagation

Big leaf hydrangeas can be propagated through stem cuttings, layering, or division. Stem cuttings are taken in mid-summer and rooted in a rooting hormone solution. Layering involves burying a branch in the soil and waiting for it to form roots before cutting it off and replanting it. Division involves digging up the plant and separating the root ball into several smaller pieces, each with its own set of leaves and roots.

Container Gardening

Big leaf hydrangeas can also be grown in containers if you don't have enough space in your garden. Choose a pot that is at least 18 inches in diameter and fill it with well-draining potting soil. Place the pot in a partially shaded area and water regularly. Fertilize once a month during the growing season. Planting big leaf hydrangeas is a rewarding experience that requires some planning and care. By following the steps outlined in this guide, you can ensure that your plants thrive and produce beautiful blooms year after year. Remember to choose the right location, prepare the soil properly, water and fertilize regularly, prune as needed, and watch out for pests and diseases. With a little effort, you can enjoy the beauty of big leaf hydrangeas in your garden for many seasons to come.

FAQs

1. When is the best time to plant big leaf hydrangeas?

The best time to plant big leaf hydrangeas is in early spring or fall when the weather is cool and moist.

2. How often should I water my big leaf hydrangea?

Water deeply once a week, especially during hot, dry weather. However, avoid overwatering, as it can lead to root rot and other fungal diseases.

3. Can big leaf hydrangeas grow in full sun?

No, big leaf hydrangeas prefer partial shade and can suffer from wilting and fading flowers in full sun.

4. How do I prune my big leaf hydrangea?

Prune your big leaf hydrangea in late winter or early spring before new growth appears. Trim back the previous year's growth by one-third to two-thirds, leaving only two or three buds per stem.

5. What is the best fertilizer for big leaf hydrangeas?

A balanced fertilizer with an NPK ratio of 10-10-10 or 12-4-8 is best for big leaf hydrangeas. Apply in early spring before new growth begins.