seedaholic, that internet site devoted to garden seeds. found it while doing an image search for celery vases. a picture of a garden with text mentioning leaf celery came up with all the images of the vases.
leaf celery being the third type of celery. the other two being the well known stem and globe ( celeriac ) celerys.
seedaholic is devoted to unusual and rare seeds, like cutting leaf celery. the online catalog lists the seeds and other gardening items they sell.
leaf celery can be used in all those recipes that the herbs parsley and cilantro have monopolized for a long time.
but the question must be does it taste as delicious as the few blanched leaves one finds at the heart of stem celery.