Do they have a drain hole? If they do not, you need a black plastic nursery pot to slip inside them.

I usually use, red or blue salvia (or both), coreopsis, and petunias. The flowers you are using, should all work fine if you have a drain hole.

They do have drain holes located on the bottom rimmed edge just before the pot tapers down. The one on the left shows more of where they are located hopefully that is enough drainage. All the previous flowers I have used I used in a hanging pot this is the first year I am trying these. All others previously mentioned flowers I have tried died out mid summer.

This is it last year.

This is a different lantana that overwintered, so I just left it and never added anything else.

Tigereye, your white flower is Scaevola.

tigereye all these did well in the heat of summer??

are the side drain holes sufficiant or should I still but a plastic nursery pot at the bottom

All did fine in the North Alabama heat (7b), except for the white flower. It couldn't take the heat. It only got watered if it rained or we were there on the weekend. The yellow lantana in the second picture, had to rely on rain only, mostly. We weren't able to go down much at all last year.

You should have plenty of drain holes. I couldn't see them until you said where they were. I have looked at pots like that for my patio and the ones I looked at didn't have them.

Floral, thank you. I probably won't buy it again, at least for the barrel. It looked great for about a month or so, but when late July hit, toast.

ETA: Maybe it was the humidity, since it is supposed to be drought resistant.

I like tall dramatic tropicals mixed with annuals..I used these plants last summer..wax and tuberous begonias..elephant ears..coleus..caladiums..ginger..sweet potato vine..lantana..asparagus fern..cannas..alternanthera..Boston ferns look nice in urns too..

Would a type of Coleus also work in full sun and withstand the heat??

wax and tuberous begonias...coleus..caladiums

===in my MI ... none of those would thrive in a pot in near full sun.. especially sun during the heat of the say ....

dont forget.. the most important thing in a pot is the media... not the plants ... start by giving them a fighting chance ...

one trick might be to do a pot in pot system ... so you could switch out the pot with the plants when they start looking ratty ... as well as changing for seasonal effect ... like mums in fall ... etc .. when you think about it.. not many annuals provide an entire season of flowering.. without intense deadheading .... and im not sure you want that level of care ......

ken

One thing that would be beautiful is geraniums with asparagus fern. Neither are really annuals, but they look great together. Thy are cheap, so if you don;t have a place to overwinter, just toss.

I also used the black pots to put in the pretty pot. Just pick a black nursery pot that is the right diameter. If it is too tall, just trim it off at the top. You do want it to fit to the bottom of the pretty pot, it doesn't have to fill to the sides, the plant will cover that or you can fill the sides with wood chips.

you did say "mostly full sun"..I should've paid more attention..I love my summer plants so much I wanted to tell you what I love growing..I've read lantana likes full sun..I admit my lantana didn't have that many blooms..I live in the shade so I'm not the one to give you the best plant suggestions..I would probably try the coleus if I were you just because I like them so much..

Coleus do not like full sun. I do love them, but they hate afternoon sun.

tigereye..all of our homes had trees and shade..I've never had a coleus in the sun..I learned the hard way "full sun" plants are disappointing for me..

sorry saturn..the plants I love might be a bad idea for you..

I tried trailing geraniums last year did not do well at all I do like the salvia and latana with the coreopsis and petunia look. And also I love the idea of pot in pot great advice

with the pot in pot my current pot is about 2.5 feet high so do I use a regular garden pot which is maybe 6" high?? and set it inside the bigger pot filling the whole large pot with dirt??

No. You either plant in the original pot OR you pick a pot that slips down in the original pot. Then you plant in THAT pot.

https://plantcaretoday.com/cachepot.html

I have lots of annuals in pots every summer, in brutal Texas heat and full sun. Some of my toughest and prettiest:

For height: Mexican Feather grass, dracaena spikes, or one of the purple/red cordylines.

For the flowering plants: marigolds, pentas, annual salvias, periwinkles, zinnias, Sunpatiens (they are tough!), mandevilla.

For the trailers: portulaca, sweet potato vines, trailing lantana.

Those are just a few you could choose from that I can assure are fine in full sun. :)

I hope my next suggestion won’t offend, but I’d paint those pots. I had some similar once and painted mine ... I’ve done a dark, mossy green and dark brown.