Problems With Celery Plants: Reasons Why Celery Is Hollow

By Amy Grant

Celery is notorious for being a finicky plant to grow. First of all, celery takes a long time to mature — up to 130-140 days. Of those 100+ days, you’ll need primarily cool weather and plenty of water and fertilizer. Even with careful pampering, celery is prone to all sorts of conditions. A fairly common one is celery that is hollow. What causes hollow celery stalks and what other problems might you encounter with celery plants?

Why is My Celery Hollow Inside?

If you’ve ever bitten into a piece of celery, I’m sure you noticed its crisp texture and satisfying crunch. Water is the key element here, and boy, celery needs a lot of it! Celery roots are short reaching, only about 6-8 inches away from the plant and 2-3 inches deep. Since celery plants can’t reach out for water, water must be brought to it. Not only does the top part of the soil need to be moist, but those stubby roots need to have nutrients nearby as well.


If celery plants are lacking water, the stalks get tough and stringy and/or the plant develops hollow celery stalks. The issue may be exacerbated by hot weather as celery doesn’t enjoy hot spells. It thrives where winters are mild, summers are cool or where there’s a long cool fall growing season.

Celery that is hollow inside also may indicate insufficient nutrients. It’s important to prepare the garden bed prior to planting celery. Incorporate large amounts of compost or animal manure along with some pre-planting fertilizer (one pound of 5-10-10 for each 30 square feet). While the plant is growing, continue to feed celery with an all-purpose liquid feed every two weeks.

How to Avoid Hollow Stalks

Problems with celery plants abound. Celery is a particular favorite of a plethora of insects including but not limited to:

As if all these uninvited dinner guests weren’t enough, celery is also susceptible to a number of diseases such as:

  • Cercospora leaf spot
  • Fusarium wilt
  • Mosaic virus
  • Pink rot fungus

Damping off, bolting and general malaise or death due to temperature fluxes can all be expected when growing celery. Celery is also prone to nutritional deficiencies such as blackheart calcium deficiency and magnesium deficiency. Because this veggie is so difficult to grow, proper preparation of the garden site is imperative.

Celery takes a long time to come to fruition, so most people get a jump on the season and start seed inside 10-12 weeks prior to the last frost. Soak the seeds overnight to speed up germination. When plants are 2 inches tall, transplant them to peat pots or a deeper flat with new soil. Transplant the plants two inches apart.

A week or two before the last frost date, when the plants are 4-6 inches high, the transplants can be moved outside. Harden them off for a week to 10 days to allow them to acclimate to the spring weather before putting them in the previously amended garden, 8 inches apart.

Side dress the celery with 5-10-10 fertilizer or manure tea during the second and third month. Use 1 tablespoon per plant, sprinkled 3-4 inches away from the plant in a shallow furrow; cover with soil. If you use tea, continue to apply weekly as you water the plants. Lastly, water, water, water!

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