- Gradually pull the soil up around the plants as they grow, keeping the leaves exposed.
- Two weeks before harvest, tie the tops together, and mound soil up to the base of the leaves.
- Cover the stalks with large cans (remove both ends first), drain tiles, or sleeves made out of paper or other material.
- Line up boards, secured with stakes, along each side of a celery row to shut out the sun.
- Water carefully after setting up your blanching system, avoiding wetting the leaves and stalks, or they may rot.
Problems: Celery’s main enemies are parsleyworms, carrot rust flies, and nematodes. See the carrot page for more information on these pests. Celery leaf tiers are tiny yellow caterpillars marked with one white stripe; control by hand picking. Attacks of tarnished plant bugs show up as black joints or brown, sunken areas.