Blueberry in Zone 7B — Southeast

Blueberries are a rewarding addition to any Zone 7B Southeast garden. Their sweet, tangy flavor is perfect for everything from pies and jams to fresh snacking straight from the bush. Plus, they thrive in our long summer, providing a beautiful display of blooms in spring and vibrant foliage in fall.

While the Southeast's hot and humid summers can present challenges, especially with fungal disease, careful timing and attention to soil conditions will set you up for success. Our 235-day growing season gives blueberries plenty of time to mature and produce a bountiful harvest.

Transplant your blueberry bushes outdoors from mid-March through early April, after the last threat of frost has passed. Purchase 2-3 year old potted plants from a reputable nursery for best results; growing from seed is a very slow process. Before planting, harden off your blueberry bushes by gradually exposing them to outdoor conditions for about a week.

When transplanting, space the bushes 4-6 feet apart to allow for adequate growth and airflow. Keep an eye on the weather forecast around transplant time; those late-season cold snaps can still happen, so be prepared to cover your young plants if necessary.

Blueberries need consistent moisture, especially during our hot and humid summers. Aim for about 1-2 inches of water per week, either from rainfall or irrigation. Stick your finger about 2 inches into the soil near the base of the plant. If it feels dry, it's time to water.

In the Southeast's humid climate, it's best to water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases. Overwatering can be just as harmful as underwatering, leading to root rot. Signs of underwatering include wilting leaves and dry, brittle branches. Overwatering can cause yellowing leaves and stunted growth.

Mulching around your blueberry bushes with pine needles is beneficial in the Southeast. It helps retain moisture and adds acidity to the soil, which blueberries love. Remember, they need a soil pH of 4.5-5.5.

Blueberries require minimal pruning, but a little maintenance each year will keep them productive. Focus on removing the oldest, thickest canes at ground level during the dormant season, typically in late winter before new growth begins.

The goal is to open up the center of the bush, allowing for better light penetration and airflow. This helps prevent fungal diseases, which are common in our humid climate. Don't prune your blueberry bushes during the first 2-3 years after planting; let them establish themselves first.

As the first frost approaches in early November, there's nothing specific you need to prune, but be sure to remove any dead or diseased branches you spot.

You can expect your first blueberry harvest from mid-June through late July, depending on the variety. The berries are ready to pick when they are fully blue and easily detach from the bush with a gentle tug. For the best flavor, wait a couple of days after they turn blue; they'll be sweeter.

Harvesting regularly encourages the plant to produce more berries. Gently roll the ripe berries off the stem with your fingers, being careful not to damage the surrounding buds and leaves.

As the end of the season approaches and the first frost looms in early November, harvest any remaining ripe berries. Don't worry about the green ones; they won're ripen off the vine.

Here are four common problems you might encounter with blueberries in the Southeast:

Birds

• What it looks like: Missing berries, signs of pecking on the fruit.
• What causes it: Birds are attracted to the ripe, juicy berries. It's a universal problem, but the Southeast's abundant bird population makes it particularly challenging.
• How to fix/prevent it: Cover your blueberry bushes with netting before the berries start to ripen.

Mummy Berry

• What it looks like: Infected berries turn pinkish-gray, shrivel up, and drop prematurely.
• What causes it: A fungal disease that thrives in cool, wet spring weather. The Southeast's humid springs create ideal conditions for its spread.
• How to fix/prevent it: Remove and destroy any infected berries. Apply a fungicide in early spring before bloom, following label instructions carefully.

Blueberry Maggot

• What it looks like: Small, white larvae inside the berries, causing them to soften and rot.
• What causes it: A fruit fly that lays its eggs inside developing blueberries.
• How to fix/prevent it: Use yellow sticky traps to monitor for adult flies. Apply an insecticide specifically labeled for blueberry maggot control, following label instructions carefully.

Iron Chlorosis

• What it looks like: Yellowing leaves with green veins, indicating an iron deficiency.
• What causes it: High soil pH prevents the blueberry bushes from absorbing iron. The Southeast's clay soil can sometimes be alkaline, exacerbating this problem.
• How to fix/prevent it: Amend the soil with sulfur or iron chelate to lower the pH. Ensure the soil is well-drained.

Southeast Specific Challenges: The combination of hot heat, humid humidity, and wet-summer rainfall in the Southeast creates a perfect environment for fungal diseases on blueberries. Consistent monitoring, good air circulation, and appropriate fungicide applications are crucial for success.

Good companions for blueberries in the Southeast include:

• Strawberries: They enjoy similar acidic soil conditions and can act as a ground cover, suppressing weeds.
• Thyme: This herb attracts beneficial insects that can help pollinate blueberry bushes.
• Basil: Basil is said to repel some blueberry pests.
• Azaleas: They thrive in similar acidic soil and create a visually appealing landscape.

Avoid planting blueberries near:

• Tomatoes and Peppers: These vegetables prefer a more neutral soil pH and can compete with blueberries for nutrients.