Murky said: If you stick to either Supertunias or Wave Petunias, there's no need to deadhead them anymore. I prefer the Supertunias, they just grow longer and bigger flowers for me, but both are very nice and both come in a good assortment of colors. Lobelia never do good for me in full sun, they always end up drying up by the end of July. Million Bells would do great and come in beautiful combo colors (or single colors if you prefer) and mix in with petunias beautifully, and they also do not need deadheading. I prefer lazy gardening when possible.
When I plant the Supertunias, 4 of them will completely fill in a 20" planter once they start growing. The containers might look bare when first planted (I usually plant by mid-May lately), but by mid-June, the planters are full, and just keep growing bigger until frost. For 12" planters, I usually plant 1 Supertunia and 2 of something else, like Million Bells, or another combination I really like is mixing in Snow Princess Alyssum with the Supertunias. If you go with regular varieties of petunias that would need deadheading, you'd probably need to at least double that amount.
I set up a drip system because they do need to stay moist and need daily watering when planted in containers, and I have about 40 containers in the back and another 10 in the front. They're also heavy feeders. I mix in a time-release fertilizer when I plant them, I use Osmocote, and then feed them once a week all summer with a liquid combination I have really good results with. So I have a fertilizer unit hooked up to the drip system in the back, that would take me hours to do the mixing and hand-watering for that many containers.
Here's a photo from last year with Supertunia Vista Bubblegum and Snow Princess Alyssum mixed in from front railing planters, this was taken September 30th, so they really do keep blooming very nicely.
Supertunia Vista Bubblegum and Snow Princess Alyssum
Murky said: Your zone is very close to mine, watering once a day should be sufficient. If you have a few days of temps over 100°, you might have do a 2nd watering later in the day, but so far I haven't had to do that. I generally water in the morning.
And a warning... I started with 1 planter on a hanging hook that I found already on the garage and thought why not try it. And each year more and more planters are added!
A lot of my planters now have flowers that attract hummingbirds, I love watching them every day and taking photos of them.
BlueRaccoon said: Thank you so much for the help! What flowers are you using to attract hummingbirds?