Celery is related to celeriac. There are self-bleaching varieties and those that stay green.
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Celery (Apium graveolens var. dulce). Family of the celeriac (Apium graveolens var. rapaceum). There are self-bleaching varieties and those that stay green. Sow the fine seed in late April, early May when the soil has warmed up; celery seed needs heat. Plant out in a sunny spot in the vegetable garden. Celery likes moist, nutrient-rich soil; prevent drying out. Germination takes three to four weeks.
Heart leaves turn black, later rot: shield bugs (Pentatomidae).
White dots on the leaf, later tunnels appear: leaf miner fly (Liriomyza spp).
Young plants remain remarkably small and leaves and stems turn slightly yellow: lack of nitrogen. Celery needs nitrogen-rich fertilizer.