I'm new to these forums but it looks like a great place to get help. This year I started a container garden on my patio. I live in north Texas where the summers are notoriously hot. Some of my flowers are doing very well and some are not. I'll provide some details about the patio and my plants and maybe someone can give me some tips?
The patio face West and gets direct sunlight from about 3pm to sunset (around 9). The temperatures often reach 104 degrees in the afternoon. There is a table on the southern end of the patio that is shaded and gets filtered sunlight during that time.
All of my pots have drain holes in them with trays underneath. I water every other day or when the soil is dry a finger length below the surface. The window box is coconut hair and gets watered daily. I drain the trays about an hour after watering the pots.
Vincas: I have two pots of Vincas that stay on the table and get sunlight filtered through the shade. They are doing very well.
Petunias: I have some in a hanging basket, some in a pot, and some in a planter box made of coconut hair. I grew the ones in the planter box from seeds and they're doing VERY well. The hanging basket is okay, and the ones in the pot are doing... okay. I have some brown leaves and areas that look a little wilted. It looks like some sort of fungus may be getting to those.
Begonias: I have two types of begonias. One has small leaves and flowers and grows in two separate pots on the ledge. They are doing okay with some new growth and some brown crispy leaves. The other variety has large leaves and flowers and sits in some slight shade to the side. It's doing well (so far)
Portulacas: I have some purple portulacas in a large pot sitting on a stand. The plant itself is lush and green but there are very few flowers. Maybe one or two at a time and they fade quickly. I just bought several plants of a different variety that I potted today. I'll see how well they do. I may have fertilized the former portulacas too much as I've read that inhibits flower growth.
Zinnias: I just spent $10 on new zinnias, planted them in pots, watered them well, drained them, and set them on the rail in the sun. The next day, 4 out of the 5 plants were fried. Brown and crispy. These are supposed to be heat tolerant! What happened?
Stargazer Lilly: There bulbs planted in a pot on the table. Growing very slowly but appear healthy. One or two leaves with a brown spot. Not anywhere close to blooming and they've been out there for 3 months.
I had spider mites that killed some of my begonias. I sprayed with an insecticide that the local nursery suggested. It killed some of the flowers I sprayed it on but I seem to have control of the mites. I washed all of the pots from the dead plants with dish soap before using them again.
Any suggestions on why some plants aren't doing well?