Celeriac

Any ideas why my celeriac failed to swell into a sizeable root (again!) The celery growing alongside also failed to produce anything much above pencil size stalks.
I'd grown them from seed in the greenhouse but both were very slow to germinate - perhaps that knocked their growing season back?

need starting off very early under some heat and glass...... even so mine this year suffered with the lack rain.....  watering does help but without the rain at the right time its problamatic

Hi, mine were poor in norfolk too dry i think, usually very good but i agree start them off early.