Green Onions in Zone 8A — Texas

Green onions are a must-grow for any Texas gardener. Their mild, fresh flavor elevates everything from tacos to salads, and they're incredibly versatile in the kitchen. Plus, there's something deeply satisfying about snipping fresh green onions from your own backyard, especially when you can grow them almost year-round in our climate.

Sure, Texas weather can be unpredictable with its extreme heat, occasional drought, and the odd late freeze. But with a long growing season of around 260 days, you have plenty of opportunities to get green onions in the ground and enjoy a continuous harvest. Knowing when to plant is key.

You can transplant green onion seedlings outdoors in early February through early March here in Texas. Starting them indoors isn't really necessary, but if you do, be sure to harden them off before planting. This means gradually exposing them to outdoor conditions for about a week to toughen them up.

When transplanting, space the seedlings about 2-3 inches apart. Keep an eye on the weather forecast; those early weeks can still bring a surprise freeze. Cover the seedlings with frost cloth if temperatures are expected to dip below freezing.

Direct sowing is the easiest way to grow green onions in Texas. You can sow seeds directly into the garden from early February through early September. This gives you plenty of time to get multiple crops in!

Prepare the soil by loosening it and amending with compost. Green onions prefer soil temperatures between 60°F and 70°F for optimal germination. Sow seeds about ½ inch deep and 2-3 inches apart. Keep the soil consistently moist until the seedlings emerge. You can also plant the root ends of store-bought green onions for a quick and easy way to get them growing. Just stick the white ends in the soil, and they'll sprout new green shoots.

Green onions need consistent moisture to thrive, especially in the Texas heat. They aren't drought-tolerant and their shallow roots can dry out quickly. Water deeply and regularly, especially during hot, dry spells.

During the spring and fall, aim for about 1 inch of water per week, either from rainfall or irrigation. In the heat of summer, you might need to increase that to 1.5-2 inches per week. Do the finger test: stick your finger about 2 inches into the soil. If it feels dry, it's time to water. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our variable humidity.

If the leaves start to turn yellow or droop, it could be a sign of underwatering. Conversely, if the leaves are yellowing and the soil is waterlogged, you might be overwatering. A layer of mulch, like shredded leaves or straw, can help retain moisture in the soil and keep the roots cool during the brutal Texas heat.

You can expect your first harvest of green onions about 60 days after planting, so from early April through late November, depending on when you sowed. Look for stalks that are about pencil-thick. That's usually a good indicator they're ready to harvest.

You can either pull up the entire plant or cut the green stalks about an inch above the soil line. If you cut them, they'll usually regrow, giving you a continuous harvest. To encourage continued production, make sure to water and fertilize regularly after harvesting.

As the first frost approaches around mid- November, harvest any remaining green onions. You can chop and freeze them for later use or try to overwinter them with a thick layer of mulch for an early spring harvest.

Here are some common problems you might encounter growing green onions in Texas:

• Onion Maggots
• What it looks like: Wilting or yellowing plants, especially young seedlings. You might find small, white maggots feeding on the roots and bulb.
• What causes it: These pests are attracted to the smell of onions and lay their eggs near the base of the plants. They thrive in moist soil.
• How to fix/prevent it: Use row covers to prevent the adults from laying eggs. Rotate your crops each year. Introduce beneficial nematodes to the soil.
• Thrips
• What it looks like: Silvery or white streaks on the leaves. The leaves may become distorted or stunted. You might see tiny, slender insects on the plants.
• What causes it: These tiny pests suck the sap from the leaves, causing damage. They are more common during hot, dry weather.
• How to fix/prevent it: Encourage beneficial insects like ladybugs and lacewings. Spray plants with a strong stream of water or insecticidal soap.
• Downy Mildew
• What it looks like: Yellow patches on leaf tops with fuzzy gray-purple growth on undersides. Leaves brown and die from the bottom up.
• What causes it: Oomycete pathogen that spreads in cool, humid conditions via wind-carried spores.
• How to fix/prevent it: Remove affected leaves immediately. Improve air circulation. Water at the base, never overhead. Copper-based fungicides for prevention. Plant resistant varieties where available.
• Pink Root
• What it looks like: The roots turn pink or reddish, and the plants may be stunted or wilted.
• What causes it: A soilborne fungus that thrives in warm, moist conditions.
• How to fix/prevent it: Improve soil drainage. Rotate your crops. Plant resistant varieties. Solarize the soil in the summer to kill the fungus.

Texas Specific Challenges: The hot-to-extreme heat and variable humidity in Texas can create a challenging environment for growing green onions. The heat can stress the plants, making them more susceptible to pests and diseases. Maintaining consistent moisture is crucial, but overwatering can lead to fungal problems. Keep a close eye on your plants and adjust your watering schedule as needed to keep them healthy and productive. Also, watch out for fire ants disturbing the soil around your plants.

Green onions are great companions for many plants in the Texas garden. Carrots benefit from green onions because the onion's scent deters carrot root flies. Lettuce thrives near green onions, as the onions can help repel aphids. Tomatoes and peppers appreciate green onions nearby, as they can deter certain pests. Beets also enjoy the company of green onions.

However, avoid planting green onions near beans and peas. They can inhibit the growth of these legumes. In our Texas gardens, companion planting can really give you an edge against pests and make the most of your space during our long growing season.