Asparagus in Zone 6A — Southeast

Asparagus is a true treat to grow here in Zone 6A. There's nothing like fresh asparagus, and the flavor is so much better than what you find at the grocery store. Plus, it's a perennial, so you'll get harvests year after year once it's established. It's a real sign of spring when those first spears pop up.

Now, we know the Southeast can be tough on plants with our hot and humid summers, plus the clay soil many of us deal with. But don't worry! Asparagus is surprisingly resilient and with our long 198-day growing season, you'll have plenty of time to get it established and producing well.

You'll want to get your asparagus crowns in the ground in early to mid April. Before you do, make sure to harden them off. This means gradually exposing them to the outdoors for about a week to acclimate them to the sun and wind.

Space the crowns about 18-24 inches apart. Keep an eye on the weather forecast around this time. We can still get some unexpected cool snaps in April, so be ready to cover the newly planted crowns if a late frost threatens.

Once your asparagus is established, it's fairly drought-tolerant thanks to its deep roots, but regular watering is still important, especially during our hot summers. During the first two years, consistent watering is key. After that, aim to give them about 1 inch of water per week, either from rainfall or irrigation.

Stick your finger about 2 inches into the soil near the base of the plants. If it feels dry, it's time to water. It's best to water at the base of the plant to avoid getting the foliage wet, which can encourage fungal diseases in our humid climate. Overwatering can lead to root rot, so make sure the soil is well-draining. Yellowing or wilting fronds can be a sign of either over or underwatering.

A good layer of mulch, like pine straw or shredded leaves, will help retain moisture in the soil and suppress weeds. Just be sure to keep the mulch a few inches away from the crowns to prevent rot.

Asparagus is pretty low-maintenance when it comes to pruning. You actually don't want to prune the ferns during the growing season. These ferns are what feed the crown and help it store energy for the next year's harvest.

Once the ferns have died back in late fall or early spring – remember, our first frost is typically around late October – you can cut them down to the ground. Remove all the dead foliage to help prevent disease. Just be careful not to damage the crowns when you're cutting. Also, don't harvest for more than about 8 weeks each season, or you'll weaken the plants.

You can expect your first harvest a couple of years after planting the crowns. In the Southeast, that first harvest can be anywhere from early April all the way through early November. The key is to harvest the spears when they're about 6-8 inches tall and the tips are still tightly closed.

Snap the spears off at ground level. Avoid cutting them, as you could damage the crown. Continue harvesting as the spears emerge, but stop when the spears start to get thin, about the thickness of a pencil. At that point, let the remaining spears fern out to replenish the plant's energy.

As the weather cools in late October, you'll notice production slowing down. This is a natural sign that the season is ending.

Here are a few problems you might run into with asparagus in the Southeast:

Asparagus Beetle

• What it looks like: Small, elongated beetles, often with orange and black markings. They and their larvae chew on spears and ferns, causing damage and weakening the plant.
• What causes it: These beetles thrive in warm weather, so they're common during our long summer.
• How to fix/prevent it: Handpick beetles and larvae. Encourage beneficial insects like ladybugs. Insecticidal soap can help with heavy infestations.

Crown Rot

• What it looks like: Yellowing or wilting ferns, stunted growth, and eventually, the crown rots and dies.
• What causes it: Poor drainage and fungal diseases, which are common in our humid climate.
• How to fix/prevent it: Plant asparagus in well-draining soil. Avoid overwatering. Improve drainage by amending the soil with compost. Remove and destroy infected plants.

Thin Spears

• What it looks like: Spears are very thin, even early in the season.
• What causes it: Over-harvesting, which depletes the plant's energy reserves.
• How to fix/prevent it: Limit your harvest to 8 weeks per season. Let plenty of spears fern out to replenish the plant's energy. Fertilize in early spring with a balanced fertilizer.

Southeast Specific Challenges: The combination of heat and humidity in the Southeast can create ideal conditions for fungal diseases, so good air circulation and proper watering are key. Also, our clay soil can be a challenge for drainage, so amending the soil with organic matter is essential for healthy asparagus growth.

Companion planting can be helpful for asparagus. Tomatoes make good companions because they deter asparagus beetles. Parsley attracts beneficial insects that prey on asparagus pests. Basil is another great choice, also helping to repel asparagus beetles.

Avoid planting asparagus near onions or garlic. These alliums can inhibit asparagus growth. Keeping these plants separated will help your asparagus thrive in our Southeast gardens.