Blackberry in Zone 7B — Texas

Blackberries are a fantastic addition to any Texas garden. Imagine sinking your teeth into a sun-ripened blackberry you grew yourself – the taste is far superior to anything you'll find at the store. Plus, they're incredibly versatile: eat them fresh, bake them into pies, or make your own jam.

Our unpredictable weather, including the extreme heat and occasional drought, can be a challenge, but blackberries are surprisingly resilient when properly cared for. With our long 255-day growing season, you'll have plenty of time to get a great harvest.

Transplant your blackberry bushes outdoors from early March through early April. This gives them a chance to get established before the full brunt of the Texas heat hits. Before planting, be sure to harden off your bare-root canes or potted plants by gradually exposing them to outdoor conditions for about a week.

When you're ready to plant, space them 3-5 feet apart, giving them plenty of room to spread. Keep an eye on the forecast for any late freezes at this time of year – our weather can be unpredictable, and a sudden cold snap can damage new growth.

Blackberries need consistent moisture, especially when they're fruiting. While they're more drought-tolerant than raspberries once established, don't let them completely dry out, especially during our hot Texas summers. A good rule of thumb is to water deeply about once a week, providing about 1-2 inches of water.

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 periods of high humidity, water at the base of the plant to avoid creating conditions that encourage fungal diseases.

Signs of underwatering include wilting leaves and dry, brittle canes. Overwatering can lead to root rot, so watch out for yellowing leaves and a musty smell. Mulch heavily around your blackberry bushes with wood chips or shredded bark to help retain moisture and suppress weeds.

Blackberries are vines and need a strong trellis to support their vigorous growth. A simple wire trellis with posts works well, or you can use a more elaborate structure if you prefer. Install the trellis before you plant your blackberries to avoid disturbing the roots later.

As the canes grow, train them along the trellis, tying them loosely with garden twine. Thornless varieties are much easier to manage on a trellis, trust me!

Pruning is essential for maintaining healthy and productive blackberry bushes. After harvest, remove the spent floricanes (the canes that produced fruit) down to the ground. These will not produce again.

In late winter or early spring, tip-prune the new primocanes (the canes that grew the previous year) at about 4-5 feet tall. This encourages branching and increases fruit production. Before the first frost in mid- November, you can remove any dead or diseased canes.

You can expect your first blackberry harvest from early May through late June, depending on the variety and the weather. The berries are ready to pick when they are fully black and pull off the cane easily without squeezing. A dull surface, rather than a shiny one, is another sign of ripeness.

Gently grasp the ripe berries and pull them away from the plant. Avoid tugging or squeezing, which can damage the canes and unripe fruit. Harvest regularly to encourage continued production.

As the first frost approaches in mid- November, harvest any remaining ripe berries. Don't expect green or reddish ones to ripen off the vine, though.

Here are some common problems you might encounter with blackberries in Texas:

Spotted Wing Drosophila

• What it looks like: Tiny flies lay eggs in ripening fruit, causing soft spots and rot. You might see small white larvae inside the berries.
• What causes it: These pests thrive in humid conditions, which we often get in Texas.
• How to fix/prevent it: Use netting to exclude the flies, apply insecticides labeled for SWD control (following label instructions carefully), and remove any overripe or fallen fruit to reduce breeding sites.

Cane Blight

• What it looks like: Dark brown or purplish lesions appear on the canes, often near wounds or pruning cuts. The canes may wilt and die back.
• What causes it: A fungal disease that enters through wounds, especially during wet weather.
• How to fix/prevent it: Prune out infected canes, disinfect pruning tools between cuts, and avoid overhead watering. Ensure good air circulation to reduce humidity.

Orange Rust

• What it looks like: Bright orange pustules appear on the undersides of leaves in spring. Infected canes may be stunted and produce little or no fruit.
• What causes it: A systemic fungal disease that infects the entire plant.
• How to fix/prevent it: Remove and destroy infected plants immediately. There is no cure for orange rust. Choose disease-resistant varieties.

Japanese Beetles

• What it looks like: Metallic green beetles skeletonize leaves and feed on flowers and fruit.
• What causes it: These pests are attracted to many plants, including blackberries, and can cause significant damage in large numbers.
• How to fix/prevent it: Handpick beetles and drop them into soapy water. Use row covers to protect plants. Insecticides can be used, but be careful not to harm pollinators.

Texas Specific Challenges: The hot-to-extreme heat and variable humidity in Texas can stress blackberry plants, making them more susceptible to diseases and pests. Ensure adequate watering, good air circulation, and proper pruning to keep your plants healthy. Fire ants can also be a nuisance, so keep them under control around your blackberry patch.

Good companions for blackberries include:

• Tansy: Repels some insect pests.
• Garlic: Deters pests and may help prevent fungal diseases.
• Green Beans: Fix nitrogen in the soil, benefiting blackberry growth.
• Mint: Attracts beneficial insects (but be careful, it can spread aggressively).

Avoid planting these near blackberries:

• Tomatoes, Peppers, Potatoes (Nightshades): These can share diseases with blackberries, increasing the risk of infection.