Celery can be harvested in multiple seasons. It requires about four months before it is ready for harvest, and needs relatively cool temperatures. Depending on the climate of your location, it may be better to plant celery in the spring, or in the late summer.

Leeks too can be harvested at any time depending on the climate. However, most leeks tend to be harvested in late summer or early fall.

I hope that answers your question!
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