Celery in Zone 6A — Great Plains

Celery, with its crisp stalks and subtle flavor, is absolutely worth the effort in our Zone 6A gardens. Fresh, homegrown celery adds a distinct taste to soups, salads, and snacks that you just can't get from the store. Plus, there's real satisfaction in coaxing this cool-season crop to thrive in our prairie soil.

Growing celery in the Great Plains comes with challenges. We face extreme temperature swings and occasional hail. But with careful timing and attention to watering, you can absolutely enjoy a successful celery harvest within our 188-day growing season.

Start your celery seeds indoors from late January through mid February, about 10 weeks before you plan to transplant. Celery seeds are tiny and need light to germinate, so don't bury them too deep. I just sprinkle them on the surface of a seed-starting mix and gently press them in.

Use seed trays with a humidity dome and provide consistent warmth, around 70-75°F. Bottom watering is key to keep the soil consistently moist without disturbing the delicate seedlings. Keep an eye on moisture levels, especially during those variable spring weeks when the furnace runs a lot!

Transplant your celery seedlings outdoors from mid April through mid May, after hardening them off for about a week. "Hardening off" simply means gradually exposing them to outdoor conditions. Start with an hour or two of sheltered sunlight and increase the time each day.

Space your celery plants 8-10 inches apart in a location that gets full sun to partial shade. Be prepared to protect young plants from late spring hail or unexpected temperature swings. A row cover can be a lifesaver.

Celery is a water hog, no two ways about it. It's the most water-demanding vegetable you can grow. You need to keep the soil consistently moist throughout the growing season to prevent hollow, bitter stalks.

During our hot Plains summers, aim to give your celery plants at least 1-2 inches of water per week, maybe more during extended heat waves. Stick your finger about 2 inches deep 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 disease in our low-to-moderate humidity.

Keep a close eye on your celery. If the leaves start to wilt or turn yellow, it's likely underwatered. If the leaves are yellowing and the plant seems stunted, you might be overwatering. A good layer of mulch around the base of the plants helps retain moisture and regulate soil temperature, which is especially helpful with our extreme weather.

You can start harvesting individual celery stalks from early July through late August, about 85 days after transplanting. Look for outer stalks that are at least 8 inches long and thick enough to use. Simply cut them off at the base of the plant with a sharp knife.

For a larger harvest, you can cut the entire plant at the base when the stalks are 12 inches or more. If you want milder stalks, try blanching them by mounding soil around the base of the plant a week or two before harvesting.

As our first frost approaches in mid- October, harvest any remaining celery. Celery is semi-hardy, but a hard freeze will damage the stalks.

Here are the most common problems you might encounter growing celery in the Great Plains:

Bolting from Temperature Stress

• What it looks like: The celery plant prematurely sends up a flower stalk, making the leaves and stalks bitter.
• What causes it: Extreme temperature swings, especially early in the season, can trigger bolting. This is common in the Plains, where we can have warm spells followed by sudden cold snaps.
• How to fix/prevent it: Choose bolt-resistant varieties. Protect young plants with row covers during temperature swings. Ensure consistent watering to reduce stress.

Hollow Stalks

• What it looks like: The inside of the celery stalks are hollow instead of solid.
• What causes it: Inconsistent watering or nutrient deficiencies. Celery needs a steady supply of moisture to develop properly.
• How to fix/prevent it: Water deeply and consistently, especially during hot, dry periods. Amend your soil with compost before planting and fertilize regularly with a balanced fertilizer.

Stringy Stalks from Heat

• What it looks like: The celery stalks are tough and stringy, making them unpleasant to eat.
• What causes it: Prolonged exposure to high temperatures. Our hot Plains summers can cause celery stalks to become stringy.
• How to fix/prevent it: Provide afternoon shade during the hottest part of the day. Ensure consistent watering. Harvest stalks when they are still young and tender.

Great Plains Specific Challenges: Our hot summers, low-to-moderate humidity, and variable rainfall make consistent watering crucial for celery. Wind protection is also essential to prevent moisture loss.

Companion planting can give your celery a boost! Green beans are great companions because they fix nitrogen in the soil, which celery loves. Cabbage family members also do well, as they don't compete for the same nutrients. Tomatoes offer some shade during our hot summers, and onions can deter pests.

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