Celery in potato trench - will this work?

Not sure if this will work or not, but I transplanted some celery seedlings into the trench made when I earthed up the potatoes recently. I'm not sure if it's self-blanching celery or not as I lost the seed packet, so I planted some in this trench which I will earth up gradually, and also made a small block of the plants (each one 8 inches from the other) as this is a close-spacing method recommended for self-blanching types as they are so close together that they keep the light out. I may need to put planks around the block later and fill the gaps between the plants with straw, but I will worry about that later- if they grow!