I'm of the school who likes to cram as many plants in a pot as I can fit then edit or not as required throughout the season. Of course, this takes a lot of watering and feeding to keep things looking good. I also spend some time once a week 'sculpting' the plants in the containers. If there is an aggressive grower it gets pruned back to make room for it's less enthusiastic partners. If something is just not doing well because it's crowded out or generally unhappy I'll remove it altogether.
Here is one of my cement urns in the back gardens when it was newly potted up for the season. This image was taken on June 10th. The plants in the arrangement are Fuchsia 'Beacon' and 'Winston Churchill', Coleus 'Aurora Black Cherry' 'The Flume' (I can't find the tag for the chartreuse one) Iresine, Begonia 'Anna Feile', Ipomoea 'Sweet Caroline Bronze', Euphorbia 'Diamond Frost' and Hibiscus 'Maple Sugar'.
During July this year we had a major heat wave with weeks above the 90 degree mark and many of the annuals especially the fuchsias decided to sulk. I'm surprised the image from July 22 shows as much blooming on the fuchsias as it does. By August the entire container was a bit overgrown and I gave it a major 'haircut' including pruning off one of the Sweet Potato Vines. I've continuously pinched out the Hibiscus, probably once a week or so to keep it at a reasonable height, Without the frequent pruning it would be seven feet tall by now. I kept hoping the Begonia would get taller than the Iresine. Well it never happened and it never bloomed either so next year, if I repeat this arrangement, I'll plant the begonia in front of the Bloodleaf so it can get a bit more light. The Fuchsia 'Winston Churchill' is taking a break from blooming but is currently setting a lot of buds. I normally get a great flush of fuchsia flowers just before the frost hits.
I normally water once a day as soon as the container has filled out and liquid feed according to manufacturers directions once a week.