Asparagus in Zone 6A — Mid-Atlantic

There's nothing quite like walking out to your garden on a cool spring morning and snapping off fresh asparagus spears for breakfast. The flavor is a world away from what you get in the store. Asparagus is a long-term investment that really pays off here in the Mid-Atlantic, giving us one of the first fresh tastes of the season and producing for years.

Our four distinct seasons are perfect for asparagus, but you do need to plan around our region's specific challenges. Our clay soil needs amending, and the humid summers can invite fungal issues if you're not careful. Still, with a growing season of around 188 days, we have plenty of time to let the plant thrive and store energy for the next year's harvest.

The best way to get started with asparagus is by planting one-year-old crowns, which are essentially dormant root systems. Trying to grow from seed will test your patience, as it adds an extra year or two before you can even think about harvesting.

Aim to get your crowns in the ground sometime from mid to late April. Our spring weather can be all over the place, so watch for late frosts. Before planting, it's a good idea to harden the crowns off for about a week. Just set them outside in a sheltered spot for a few hours the first day, gradually increasing the time until they're out all day and night.

Dig a trench about 6 inches deep and space the crowns 18-24 inches apart, spreading their roots out like an octopus. Cover them with a couple of inches of soil, and as the spears grow, gradually fill in the trench throughout the season. This encourages the crown to establish itself deep in the soil, protecting it from our cold winters.

Here in the Mid-Atlantic, our reliable rainfall means you won't be chained to the hose for your asparagus patch once it's established. For the first year, however, you'll want to provide consistent moisture to help those crowns get settled. Aim for about an inch of water a week, including rain.

After the first couple of years, the deep roots make asparagus quite drought-tolerant. During our typical humid summers, you might only need to water during extended dry spells. The best way to know is the finger test: stick your finger into the soil about two inches down. If it's dry, it's time to water.

Always water at the base of the plants. Overhead watering is a bad idea in our humid climate, as it leaves the ferns wet and creates a perfect environment for fungal diseases to take hold. A good, deep soak every week or so during a drought is much better than a light sprinkle every day. A layer of straw or shredded leaf mulch will also help retain soil moisture and keep weeds down.

With asparagus, the main "pruning" is actually just letting it grow. After your harvest period ends, you must let the remaining spears grow into tall, feathery ferns. This is non-negotiable; those ferns are the plant's solar panels, gathering energy all summer to feed the crown for next year's crop.

Don't be tempted to trim or neaten up the ferns during the growing season. Let them do their work. You'll see them turn yellow and then brown after our first hard frost, usually sometime around mid-October.

Once the ferns are completely dead and brown, you can cut them down to the ground. You can do this in late fall or wait until early spring before the new spears emerge. Leaving them up over winter can help trap a little snow for insulation, but cutting them in the fall removes any overwintering pests like asparagus beetle eggs.

Patience is key with asparagus. You must wait until the third year after planting crowns before you take your first real harvest. In that second year, you might be able to snap off one or two spears per plant, but that's it. Resisting the urge to over-harvest early on is what builds a strong, long-lived patch.

Your harvest window in the Mid-Atlantic typically runs from mid-April through early June. Start looking for spears to emerge as the soil warms up. The ideal time to harvest is when the spears are about 6 to 8 inches tall and the tips are still tight. You can either snap them off at the base with your hands or use a clean knife to cut them just at or below the soil line.

Harvest every few days to keep the plant productive. After about six to eight weeks, you'll notice the new spears emerging much thinner, about the width of a pencil. This is your signal to stop. Let all subsequent spears grow into ferns to power the plant for the following spring.

• What it looks like: Small, oval-shaped beetles, either black with white spots or orange with black spots. You'll also see their dark, sticky eggs lined up on the spears and ferns. They chew on spears, causing them to bend or scar, and strip the foliage off the ferns.
• What causes it: These pests are specialists that feed only on asparagus. They overwinter in plant debris and emerge in spring right when the spears do.
• How to fix/prevent it: Hand-pick the beetles and drop them into soapy water, especially in the morning when they're sluggish. For the eggs, just run your fingers up the spear to crush them. Clean up all plant debris in the fall to reduce overwintering sites.

• What it looks like: The base of the plant becomes mushy, spears are weak or fail to emerge, and the ferns may yellow and wilt from the bottom up.
• What causes it: This is almost always caused by poor drainage. Our heavy clay soil holds water, and if the crowns sit in soggy ground, they will rot. Our humid, wet springs can make this worse.
• How to fix/prevent it: Prevention is everything here. Before you even plant, amend your soil heavily with compost to improve its structure and drainage. Planting in raised beds is an excellent strategy in the Mid-Atlantic to ensure the crowns never sit in waterlogged soil.

• What it looks like: The spears that emerge are consistently spindly and pencil-thin, even at the beginning of the harvest season.
• What causes it: This is a sign of a stressed or exhausted crown. The most common cause is harvesting for too long in the previous season or harvesting too heavily from a young plant. Low soil fertility can also be a factor.
• How to fix/prevent it: Stick to the harvest rules: don't harvest at all the first year, only a tiny bit the second, and no more than 8 weeks for mature plants. Stop immediately when spears get thin. Top-dress your bed with a layer of compost each spring to provide the nutrients the crowns need.

#### Mid-Atlantic Specific Challenges Our humid summers are the biggest challenge, making fungal diseases a constant threat if you don't ensure good air circulation and avoid overhead watering. While our reliable rainfall is a plus, it can work against you with our clay soil, making soil amendment and good drainage absolutely critical to prevent crown rot. Deer pressure is another reality here; they will browse the tender new spears in spring, so fencing might be necessary depending on your location.

Companion planting can really help your asparagus patch thrive. Tomatoes are a great partner because they release a chemical compound that can deter the asparagus beetle. In return, asparagus is said to help repel nematodes that can bother tomato roots. This pairing works well in our long growing season, as the tomatoes will be growing tall just as the asparagus ferns provide some dappled shade.

Herbs like parsley and basil are also beneficial neighbors. They are thought to repel some pests that might bother the asparagus. Just be sure to give everything enough space so the asparagus ferns don't completely shade out their shorter companions later in the summer. Avoid planting anything from the allium family—like garlic, onions, and shallots—nearby. They produce chemicals that can stunt the growth of the asparagus spears.