How Do You Define 'Potent?'

If I eat a gram of raw cannabis, it won't do anything for me. That same gram will keep me medicated for half a day.

Most edibles are made from trim and poor quality cannabis. Trim has a higher quantity of CBN (degraded thc) and contributes to the 'inability to stay awake' feeling. Poor quality cannabis is often harvested late, also with increased CBN, causing you to sleep.

The potency of edibles depends more on the terpenes that are retained during processing, rather than the overall thc/cbd ratios. This is also why cheap edibles are a 'flat' experience compared to smoking. The fewer the terpenes retained, the flatter the experience.

Clean cannabis is what you want for edibles, here's a post to help you get started on your education. :)