Bigger Drainage hole for HEB?

[creister]

I made my boxes last year with a 1/4 inch hole for the drain hole. I was thinking of making it slightly larger to 3/8 of an inch? It seemed that the drain holes plugged up easily from small pieces of growing medium and wouldn't drain properly. Some boxes I used pro-mix and others with Al's mix. Of course, once I realized what was happening, a screwdriver or large nail would easily clear the hole.