@Newyorkrita brows many things in pots, some of them on her driveway. I know that peas were among those things. She had an article waiting to be published ...
If you don't have a convenient place for water to drain to when you water pots enough to come out the bottom, you might build a tray from 2x4s and heavy plastic, then use a wet-dry vac to remove the slaty water.
I always distrust containers going too long if they are never watered heavily enough to flush left-over fertilizer out the bottom. That might be more my personal bug-a-boo than something that is an issue for most people.
I also have a dread of over-watering, because I have killed many trays of seedlings by over-watering. That's why I urge people to use a container mix that is coarse enough to let excess water drain out, and lets air diffuse back in. I like screened evergreen bark (pine, fir, balsam, or just "mulch"). Nuggets from 1/10" to 1/4" or even 3/8" improve drainage, as long as the rest of the mix is not so powdery or fine that it fills in all the gaps between the nuggets.
