Celery in Zone 8B — Southeast

Growing your own celery in the Southeast is rewarding. Fresh celery has a bright, clean taste that store-bought just can't match. Plus, it's incredibly versatile in the kitchen, adding a crisp bite to everything from soups and stews to salads and crudités.

Our hot and humid summers can present some challenges, but don't let that deter you. By starting celery indoors and timing your transplant just right, you can take advantage of our long 255-day growing season and enjoy a successful harvest.

Starting celery from seed indoors is essential in our region, giving it a head start before the heat really kicks in. Begin your seeds indoors from late December through mid January. This gives the seedlings about 10 weeks to develop before transplanting.

Use seed trays with a good seed-starting mix. Celery seeds are tiny and need light to germinate, so don't bury them too deep – just press them gently onto the surface of the soil. Keep the soil consistently moist by bottom watering, and maintain a temperature of around 70-75°F. A sunny windowsill or grow lights will provide the light they need. Remember, our spring can have temperature swings, so keep an eye on the seedlings if they're near a window.

Transplant your celery seedlings outdoors from early March through early April, after the last expected frost. Before transplanting, harden them off for about a week by gradually exposing them to outdoor conditions. This helps them adjust to the sun and wind.

Space the plants about 8-10 inches apart in rows. Our weather can still be unpredictable at this time of year, so keep an eye on the forecast for any late cold snaps. Be ready to cover the young plants if needed.

Celery is a thirsty plant, and consistent watering is crucial for success in our hot, humid climate. It needs consistently wet soil, so plan to water deeply and regularly. Even brief dry spells can cause hollow, bitter stalks.

During the warmer months, especially with our afternoon thunderstorms, check the soil moisture frequently. Stick your finger about 2 inches deep into the soil. 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 increase the risk of fungal diseases in our humid environment.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, so make sure the soil is well-draining. A layer of mulch, like pine straw, helps retain moisture and suppress weeds.

You can expect your first celery harvest from early June through late July, about 85 days after transplanting. Look for outer stalks that 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 more.

For a milder flavor, try blanching the stalks by mounding soil around them a couple of weeks before harvest. Continue harvesting throughout the summer by taking outer stalks, allowing the inner ones to keep growing. As our first frost approaches in mid- November, harvest any remaining celery.

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

Bolting from temperature stress

• What it looks like: The plant prematurely sends up a flower stalk.
• What causes it: Fluctuations in temperature, especially early in the season, can trigger bolting.
• How to fix/prevent it: Choose bolt-resistant varieties. Provide consistent watering and protection from temperature swings, especially during transplant.

Hollow stalks

• What it looks like: Stalks are hollow and may have a bitter taste.
• What causes it: Inconsistent watering and nutrient deficiencies, especially boron.
• How to fix/prevent it: Water regularly and deeply. Amend the soil with compost and consider a balanced fertilizer, paying attention to boron levels.

Stringy stalks from heat

• What it looks like: Stalks are tough and stringy, making them less palatable.
• What causes it: High temperatures, especially during the long summer, can cause the stalks to become stringy.
• How to fix/prevent it: Provide afternoon shade during the hottest part of the day. Ensure adequate watering and consider planting varieties that are more heat-tolerant.

Southeast Specific Challenges: Our hot, humid summers increase the risk of fungal diseases like early and late blight. Providing good air circulation, avoiding overhead watering, and using disease-resistant varieties can help. Japanese beetles can also be a nuisance, so be prepared to handpick them or use appropriate organic controls.

Companion planting can improve your celery crop. Green beans are good companions because they fix nitrogen in the soil, which benefits celery. Cabbage also works well, as it deters some common celery pests.

Tomatoes are good neighbors, as they provide shade during the hottest part of the day. Onions can deter pests that might bother your celery. Avoid planting carrots near celery, as they compete for the same nutrients in the soil.