There are lots of different kinds of petunias. For instance, the Madness Summer Series can take the heat, but petunias typically are not known for that.
Search results for:
Mulch of all types saves water and reduces weeding. But unlike rock mulch, wood chip mulch will rot into the soil.
Anyone who has been gardening for a while has a horror story or two about hornworms, which infest many vegetables in the tomato family.
Boron is one of the salts commonly found in desert soils. It can be present naturally or it can accumulate over the years in such places as horse corrals.