Celery in Zone 7B — Texas

Celery, with its crisp texture and refreshing flavor, is a rewarding challenge for Texas gardeners. Fresh, homegrown celery adds a depth of flavor store-bought celery just can't match, making it a worthwhile addition to your garden despite the Texas heat. Plus, it's incredibly versatile in the kitchen, from soups and salads to snacks with peanut butter.

Growing celery in Texas does present challenges, with our unpredictable weather and periods of intense heat. But with a good understanding of its needs and careful timing, you can successfully grow celery within our long, 255-day growing season.

Starting celery indoors is the way to go in Texas, giving it a head start before the heat hits. Begin your seeds indoors from late December through mid January, about 10 weeks before you plan to transplant them outside. Celery seeds are notoriously slow to germinate, so patience is key.

Use seed trays with a good seed-starting mix. Keep the soil consistently moist (bottom watering is your friend here!) and provide warmth, ideally around 70-75°F. Celery seeds need light to germinate, so don't bury them too deeply; just gently press them into the surface of the soil. Since our spring can come early, this head start is essential.

Transplant your celery seedlings outdoors from early March through early April, once the danger of a hard freeze has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Texas sun and wind.

Plant your celery seedlings 8-10 inches apart in well-draining soil that's rich in organic matter. Keep a close eye on the weather forecast around transplant time. Those early spring temperature swings can be tough on young plants.

Celery is a very thirsty plant, and consistent moisture is crucial for success in the Texas climate. It's probably the most water-demanding vegetable you can grow. Aim to keep the soil consistently moist, but not waterlogged.

During the hotter months (late spring into summer), you'll likely need to water deeply every other day, or even daily during the most intense heat. Use the "finger test" to check the soil moisture about 2 inches deep; if it feels dry, it's time to water. Aim for about 1-2 inches of water per week, depending on rainfall. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our variable humidity. Signs of underwatering include wilting leaves and bitter-tasting stalks. Overwatering can lead to root rot, so be mindful of drainage.

A good layer of mulch around your celery plants can help retain moisture in the soil and suppress weeds. Organic mulches like shredded leaves or straw work well in our region.

You can expect your first celery harvest from early June through late July, about 85 days after transplanting. Start harvesting when the outer stalks are at least 8 inches long. You can harvest individual stalks as needed, allowing the plant to continue producing, or you can cut the entire plant at the base when the stalks are 12 inches or longer.

For a milder flavor, you can blanch the stalks by mounding soil around them a few weeks before harvest. This blocks sunlight and reduces chlorophyll production. As our first frost approaches in mid- November, harvest any remaining celery before temperatures drop too low. Celery is semi-hardy, but a hard freeze will damage it.

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

Bolting from Temperature Stress

• What it looks like: The plant sends up a flower stalk prematurely, and the stalks become bitter and tough.
• What causes it: Bolting is triggered by temperature fluctuations, especially a sudden shift from cool to hot. This is common with our unpredictable spring weather.
• How to fix/prevent it: Choose bolt-resistant varieties. Provide consistent watering and shade during periods of intense heat. Plant at the right time, to avoid the worst temperature swings.

Hollow Stalks

• What it looks like: The celery stalks develop hollow centers.
• What causes it: Inconsistent watering or nutrient deficiencies (especially boron). The Texas heat exacerbates this issue.
• How to fix/prevent it: Ensure consistent watering, especially during hot, dry periods. Amend the soil with compost or a balanced fertilizer before planting. A foliar spray of boron can help if a deficiency is suspected.

Stringy Stalks from Heat

• What it looks like: The celery stalks become tough and stringy, making them less palatable.
• What causes it: Prolonged exposure to high temperatures. Texas heat can really do a number on celery.
• How to fix/prevent it: Provide afternoon shade during the hottest part of the day. Ensure adequate watering and soil moisture. Harvest promptly once the stalks reach the desired size.

Texas Specific Challenges: The hot-to-extreme heat, variable humidity, and unpredictable rainfall of Texas make growing celery a challenge. Consistent watering is crucial to prevent bolting, hollow stalks, and stringiness. Mulching and providing afternoon shade can help mitigate the effects of the heat.

Companion planting can help your celery thrive in the Texas garden.

• Green Beans: These help fix nitrogen in the soil, which benefits celery's growth. Plant them nearby, as they improve the soil naturally.
• Cabbage: Cabbage family plants can deter some pests that might bother celery.
• Tomato: Tomatoes provide some shade for celery, which is helpful during the hottest parts of the day.
• Onion: Onions deter certain pests, like aphids, that can attack celery.

Avoid planting celery near carrots. Carrots and celery compete for the same nutrients in the soil, which can stunt the growth of both plants.