Celery Growing Problems Troubleshooting

Author: Geoff

Jul. 08, 2024

Celery Growing Problems Troubleshooting

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Celery requires plenty of moisture, fertile soil, and a long, cool growing season.

Celery requires plenty of moisture, fertile soil, and a long, cool growing season.

You can start celery from seed, but germination is slow&#;about four weeks.

Sow seeds indoors at least 10 weeks before seedlings are to be set out.

A better plan might be to purchase celery starts when you are ready to plant.

Even with moisture, fertile soil, and the right climate for growing, celery is seldom trouble-free. Celery is susceptible to many pests and diseases. Here is a list of possible celery-growing problems matched with cures and controls:

(For celery growing tips see Celery Growing Success Tips at the bottom of this post.)

Good Products for Pest and Disease Control at Amazon:

Here are common celery-growing problems with cures and controls:

Seed and seedling problems

Seeds rot or seedlings collapse with dark water-soaked stems as soon as they appear

Damping off is a fungus that lives in the soil, particularly where humidity is high. Do not plant in cold, moist soil. Make sure the soil is well drained.

Seedlings are stunted, plants appear stunted; roots appear to have knots or beads

Root-knot nematodes are microscopic worm-like animals that live in the film of water that coat soil particles; some are pests, and some are not. Root-knot nematodes feed in the roots and stunt plant growth; they are most common in sandy soils. Rotate crops. Solarize the soil with clear plastic in mid-summer.

Young stems chewed

Young earwigs feed on plant shoots and eat holes in foliage. Most often the damage is tolerable and the infestation is light. For a heavy infestation, use traps of rolled wet paper or old flowerpots stuffed with paper to catch earwigs at night. Dump them in soapy water. Keep the garden free of plant debris. Spray with hot pepper and garlic repellent.

Leaf and stem problems

Leaves curl under and become deformed and yellowish

Aphids are tiny, oval, and yellowish to greenish pear-shaped insects that colonize the undersides of leaves. They leave behind sticky excrement called honeydew which can turn into a black sooty mold. Remove with a blast of water. Use insecticidal soap. Aluminum foil mulch will leave aphids disoriented.

Tunnels or blotches in leaves

Leafminer larvae tunnel inside leaves. Destroy infected leaves and caterpillars. Cultivate the garden to destroy larvae and keep adult flies from laying eggs. Cover crops with floating row covers to exclude flies.

Leaves folded under and webbed; holes chewed in leaves and stalks

The celery leaftier is a pale green caterpillar with a white stripe down its back that grows to ¾-inches long; the adult moth is small brown with dark wavy lines in its wings. Handpick and destroy. Remove leaves that shelter caterpillars. Use Bacillus thuringiensis.

Irregular small holes eaten in leaves

A cabbage looper is a light green caterpillar with yellow stripes running down the back; loops as it walks. Keep the garden clean of debris where adult brownish night-flying moths can lay eggs. Cover plants with spun polyester to exclude moths. Pick loppers off by hand. Use Bacillus thuringiensis. Dust with Sevin or rotenone.

Irregular holes in foliage and stems

Celeryworm is the grown and white larva of the black swallow-tail butterfly. Usually, few are found. Pick off by hand. Spray with Bacillus thuringiensis (Dipel). Spray or dust with Sevin, pyrethrum, and rotenone.

Leaves are eaten and plants are partially defoliated

Blister beetles and tomato hornworms eat leaves. Handpick insects and destroy them. Keep the garden weeds and debris. Cultivate in spring to kill larvae and interrupt the life cycle. Pick off beetles by hand. Spray or dust with Sevin or use a pyrethrum or rotenone spray.

Large holes are eaten in leaves; trails of sliver slime

Snails and slugs prefer cool temperatures. Handpick and destroy; place protective borders of sand, lime, or wood ashes around plants. Mulch with wood shavings or oak leaves.

Tips and leaf margins become streaked and look scorched

Magnesium deficiency. Have the soil tested. Use magnesium chelates. Plant resistant varieties: Emerson Pascal, Utah 52-75.

Brown spots on leaves and stems; plants become stunted and die

Late blight of celery is caused by Septoria fungus a soil and seedborne disease triggered by heat and humidity following a rainy period. Keep the garden clean and free of weeds. Remove infected plants. Improve soil drainage.

Yellow spots on outer leaves enlarge to become gray-brown streaks

Celery early blight or Cercospora leaf spot is a fungal disease spread by heavy rainfall and warm temperatures. Keep weeds down in the garden area; they harbor fungal spores. Avoid overhead watering.

Mottled green and yellow leaves; zigzag bands may develop, distorted leaves

Mosaic virus has no cure; it is spread from plant to plant by aphids and leafhoppers. Plant disease-resistant varieties. Remove diseased plants. Remove broadleaf weeds that serve as virus reservoirs.

Zigzag paths into the crown and heart of celery

White with brown, legless grubs are the larvae of the carrot weevil, a dark crown to coppery, hard-shelled weevil to 1/5 inch long. Stunted plants Carrot weevil larvae are white grubs with dark heads that feed at the crown of celery.

Central leaves turn dark

Similar to blackheart, this is the work of the tarnished plant bug a greenish yellow to brown bug to ¼-inch long with yellow triangle marks at the end of each wing. The tarnished plant bug sucks sap from the plant causing the tissue to break down; the leaves at the center of the plant turn gray and black while the outer stalks appear healthy.

Stalks problems

Twisted, brittle stalks; plants yellowed and stunted

Aster yellows is a mycoplasma disease spread by leafhoppers. Remove infected plants. Control leafhopper. Keep the garden free of weeds which can harbor disease.

Inner stalks and leaves die at tips and turn brown or black

Blackheart is associated with soil calcium deficiency. Calcium deficiency can inhibit the uptake of water into plants. Increase watering and mulch to conserve soil moisture. Test soil; add gypsum or limestone if the soil is calcium deficient. Maintain soil pH between 6.5 and 8.0. Plant disease-resistant celery varieties: Cornell 19, Emerald, Emerson, Golden Pascal.

Celery stems crack crosswise; stems are stiff and brittle; leaf edges may be streaked and brown

Boron deficiency is often found in alkaline soils. Test soil. If deficient, add 2 ounces of borax per 30 square yards. Plant disease-resistant varieties of celery: Golden Self-Blanching, Dwarf Golden Self-Blanching, Giant Pascal, Utah 52-70.

Water-soaked spots on stalks with cottony pink mold at the base

Pink rot fungus grows at soil surface level in cool, wet conditions. Remove and destroy infected plants. Keep the garden free of weeds where fungal spores can rest.

Stalks tough, bitter

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Possibly: stalks over-mature; high temperatures; dry soil; poor fertility. Harvest when tender. Plant so that celery comes to maturity in cool weather. Keep plants evenly moist throughout the growing season. Side dress feed plants with aged compost.

Whole plant problems

Leaves turn yellow and then brown from the bottom up; plant loses vigor; plants appear stunted; worms bore into roots

Wireworms are the soil-dwelling larvae of click beetles; they look like wiry-jointed worms. Check the soil before planting; flood the soil if wireworms are present. Remove infested plants and surrounding soil.

Plants produce lots of leaves but not stalks; growth is slow

Sudden temperature fluctuations during early growth. Protect young plants from cold; use horticultural cloth or cloches when temperatures are low. Don&#;t plant too early.

Plant turns pale green, yellows beginning on one side, yellowing spreads; stems rot; plant wilts

Fusarium wilt or stem rot is a soilborne fungus that infects plant vascular tissue, usually where the soil is warm. Plant in well-drained soil. Rotate crops. Remove and destroy infected plants. Grow resistant varieties: Cornell No. 19.

Flowers

Bolting; plants flower and go to seed

Celery will bolt prematurely if plants are exposed to too many days with temperatures below 55°F. Protect young plants from cold; use horticultural cloth or cloches when temperatures are low. Don&#;t plant too early.

Celery growing success tips

Planting

Grow celery in full sun. Celery grows best in well-drained, moisture-retentive soil rich in organic matter. Celery can be grown from seed but it is very small and slow to germinate, at least 4 weeks. Plant celery in well-dug beds prepared with aged compost

Planting time

Sow seed indoors for 10 to 12 weeks before transplanting starts in the garden. Set out celery just after the average last frost date in spring. Celery requires about 120 days of daytime temperatures in the 60s and nighttime temperatures in the 50°Fs. To grow a fall crop, set out transplants in late summer.

Care

Celery requires soil rich in organic matter; prepare planting beds with 2 to 4 inches of aged compost and work the compost into the soil to 12 inches deep or dig a trench about 12 inches deep and fill it with aged compost before planting along the backfilled trench. Celery requires even, consistent watering; use drip irrigation or a soaker hose; do not allow celery to dry out during the growing season. Protect celery with row covers if the temperature dips below 50°F.

Harvest

Begin the celery harvest when stalks are 6 to 8 inches tall. Cut outer stalks first so that plants will continue to produce new stalks. When plants form flower stalks harvest the whole plant at once.

Celery articles at Harvest to Table:

How to Plant and Grow Celery

Celery Seed Starting Tips

How to Harvest and Store Celery

Tasty Ways to Cook and Serve Celery

Celery Growing Problems Troubleshooting

Common Vegetable Garden Pests

Vegetable Garden Diseases Problem Solver

Vegetable Garden Organic Weed Control

Garden Planning Books at Amazon:

Five Tips For Growing Celery

The first time I grew celery, I was surprised by how much flavor homegrown celery has. The added flavor, along with the convenience of harvesting a stalk or two as needed, means celery has earned a forever place in my cool-season garden. Learning how to grow celery is easier than you think. Learn how to grow celery with these 5 tips. See the end of the article for a bonus tip about how to grow celery in containers.

Disclaimer: this post on growing celery contains affiliate links. See my disclosure policy for more information.

5 Tips for How to Grow Celery

1. Choose your planting method for growing celery 

Plant celery from seed, transplants, or even the cut-off base of a grocery-store bunch. Here&#;s what I&#;ve learned about the different methods:

  • Starting seeds indoors gives you control over the variety and generally yields the largest plants and most consistent results. 
  • If you find transplants at your local nursery, it&#;s a great way to get a quick start.
  • A cut-off base is a simple way to grow celery and is fun for kids to try in the garden. 

Try all three methods for growing celery and see which one works best for you.  

Plant a cut-off celery base, and new celery will sprout and grow.

Here&#;s a video tutorial that explains how to grow celery from a cut-off base.   

Start celery seeds indoors 10-12 weeks before your last frost date. Transplant celery seedlings (or cut-off celery bases) when the soil temperature is at least 50°F (10°C).

Celery planting dates for the low desert of Arizona:

  • Start seeds indoors: July &#; September
  • Plant transplants outside: September 15 &#; November

Transplant seedlings (or cut-off celery bases) outside 8-10 inches apart at the same level as the nursery pot. For square foot gardening, plant 4 celery per square.

If planting from seed in the garden (not recommended because of the need for a long growing season), plant seeds 1/4 inch deep and thin to 8-10 inches apart when seedlings are about 6 inches tall.

2. Celery needs plenty of water & nutrients to grow

Celery that does not receive enough water will be hollow, stringy, and bolt.

When growing celery, the soil must be consistently moist, not soggy. If celery dries out, it can be stringy, bitter, and bolt. Mulching the soil after planting helps keep celery from drying out. I use garden grids to water my garden with excellent results.

Celery grows best in compost-rich soil that is high in organic matter.

Fertilize celery with a fish-emulsion solution once a month throughout the growing season. To do this, add fish emulsion to a container and fill it with water, following the dilution instructions on the label.

Fish emulsion is an excellent source of organic nutrients and nitrogen that will not burn plants. It is easily absorbed and quickly taken up by the roots of the plants.

You can also amend the soil around celery with compost. Feeding your celery allows it to thrive.  

3. Blanch celery before harvesting (if desired)

Blanching celery (even self-blanching types) helps eliminate the bitter taste and makes it sweeter and more tender. Unblanched stalks are darker green and tougher but contain more nutrients than the lighter-blanched varieties.

To blanch celery, about two weeks before harvesting, wrap or cover stalks with heavy paper, soil or mulch, juice or coffee cans, boards, or other items to keep out the light. Leaves should be exposed. 

4. Harvest celery as needed throughout the season

  • For the best flavor, water celery well the day before harvesting.

  • Harvest single stalks as needed from the outside of the plant when it reaches the desired height.

Harvest celery until it begins to get hot. For me, in Arizona, that means late spring.

Cut the entire stalk at soil level with a knife Bolting celery

Celery doesn&#;t like hot temperatures, and as it heats up, it will become bitter. As summer nears, blanch the celery (if desired) and harvest the entire plant. To harvest the whole plant, cut it at soil level with a knife. 

If left in the ground, the celery may also bolt, meaning that the plant focuses on producing seeds. When it bolts, the central stalk of the celery becomes taller, flowers, and produces seeds.

5. Preserve harvested celery in several ways 

Store harvested stalks of celery in water to keep them fresh

Homegrown celery has so much flavor and is worth preserving if you can&#;t use all the garden produces. 

  • Celery will keep in the fridge for several weeks if wrapped in foil or submerged in water in a sealed container. 
  • To freeze celery: Chop, then blanch in boiling water for 2 minutes. Drain, and put blanched celery on a cookie sheet, and freeze. Once the celery is frozen, store it in freezer bags for up to a year. 
  • Dehydrate or freeze-dry celery. Grind into celery powder before using; it does not hydrate well. 
Chopped celery Dehydrating celery Freeze drying celery Celery powder

Bonus Tip: How to grow celery in containers

Celery is a good choice for containers.

  • Choose a container for growing celery that holds at least 3 gallons of soil.
  • Be diligent about watering container-grown celery. Celery that does not get enough water has hollow stalks and is stringy.
  • Feed celery in containers with a half-strength application of liquid organic fertilizer every two weeks during the growing season.

If you enjoyed this post about how to grow celery, please share it:

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