Celery in Zone 6B — Texas

Celery might not be the first thing that comes to mind for a Texas garden, but its crisp, refreshing flavor is a welcome addition to soups, salads, and snacks, especially when you've grown it yourself. Plus, the satisfaction of coaxing this cool-weather lover through our unpredictable weather is a reward in itself.

Growing celery here has its challenges, from the early warmth of spring to the brutal Texas heat. But with a little planning and attention to timing, you can absolutely enjoy homegrown celery. Our long, 230-day growing season gives us the edge we need to make it work.

Start your celery seeds indoors in early to late January. Celery needs a long head start to mature before the Texas heat really kicks in. You'll need seed trays, a good seed-starting mix, and a warm, brightly lit area – a sunny windowsill or grow lights work well.

Celery seeds are tiny and need light to germinate, so don't bury them too deep. Sprinkle them on the surface of the soil and gently mist with water. Bottom watering is your friend here; set the tray in a shallow dish of water and let the soil soak it up to keep the surface moist without disturbing the seeds. Given that we often see early warmth in Texas, starting early indoors is crucial to get a jump on the season.

Transplant your celery seedlings outdoors in late March through late April. This gives them time to establish before the real heat arrives. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space your celery plants 8-10 inches apart in a spot that gets full sun to partial shade. Keep a close eye on the weather forecast around this time. We can still get some unpredictable freezes, so be prepared to cover your young plants if necessary.

Celery is thirsty – really thirsty! In the Texas heat, consistent watering is the key to preventing hollow, bitter stalks. This is probably the most water-demanding vegetable you can grow.

During the spring, aim for at least 1 inch of water per week, increasing to 2 inches or more once the summer heat hits. The finger test is your best friend: stick your finger about 2 inches into the soil near the plants. If it feels dry, it's time to water. Because humidity can be variable, water at the base of the plants to avoid fungal diseases. Overhead watering is fine as long as you do it early in the day so the foliage can dry before nightfall.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, so make sure your soil drains well. A good layer of mulch, like shredded leaves or straw, will help retain moisture and keep the soil cool, which is essential in our climate.

You can expect your first celery harvest from mid June through early August. Celery is ready to harvest when the outer stalks are at least 8 inches long. You can harvest individual stalks as needed, or cut the entire plant at the base when the stalks are 12 inches or longer.

For a milder flavor, blanch the stalks by mounding soil around them a week or two before harvesting. To encourage continued production, harvest the outer stalks first, leaving the inner ones to mature. As the first frost approaches in early November, harvest any remaining celery before it gets damaged.

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

Bolting from Temperature Stress

• What it looks like: The plant starts to send up a flower stalk prematurely. The stalks become bitter and tough.
• What causes it: Fluctuations in temperature, especially early warm spells followed by cooler weather, can trigger bolting.
• How to fix/prevent it: Choose bolt-resistant varieties. Plant at the right time (late March to late April) to avoid temperature swings. Consistent watering and mulching can also help regulate soil temperature.

Hollow Stalks

• What it looks like: The celery stalks develop a hollow center.
• What causes it: Insufficient watering or nutrient deficiencies.
• How to fix/prevent it: Maintain consistent soil moisture. Fertilize with a balanced fertilizer according to package directions.

Stringy Stalks from Heat

• What it looks like: The celery stalks become tough and stringy, making them unpleasant to eat.
• What causes it: High temperatures during the growing season.
• How to fix/prevent it: Provide partial shade during the hottest part of the day. Ensure consistent watering. Choose heat-tolerant varieties.

Texas Specific Challenges: The combination of hot-to-extreme heat, variable humidity, and unpredictable rainfall in Texas makes growing celery particularly challenging. Consistent monitoring of soil moisture and temperature is crucial. Be prepared to adjust your watering schedule based on the weather, and don't be afraid to provide extra shade during the hottest months.

Good companion plants for celery include green beans, cabbage, tomatoes, and onions. Green beans fix nitrogen in the soil, which benefits celery. Cabbage repels some pests that might bother celery. Tomatoes provide shade, helping to keep the soil cool. Onions deter certain pests and diseases.

Avoid planting carrots near celery, as they compete for the same nutrients in the soil.