Thank you for this information and advice! I think I will wait to plant my perennial seeds until fall now! I don't want to be disappointed and I want to have flowers this summer, so I think I'd be better off buying some that are already grown instead. Thanks again for the information!!
To be honest I think that would be a very good way of getting started - as at least that way you would be able to get some established prior to planting your seeds in the autumn - especially as - at this time of year there is normally plenty of choice in most garden centers and as you are wanting something that will flower all summer long and withstand strong sunlight as well as cope with intense heat - you wouldn't go far wrong if you were to chose any of the following - as they all thrive in strong sunlight and temperatures that go up to and above 45 degrees centigrade - as well as flower continuously throughout the summer
All plants with daisy like flowers such as Asters, Gaillardias, Gazanias and Argyranthemums are known for being able to cope with these conditions and if looking for something that is easy to grow and something that will quickly establish itself - you can't go too far wrong - with Argyranthemums which come in a wide range of colors as well as this one called
Madeira Deep Pink
All varieties of Sedum, Veronicas and Coreopsis thrive in these conditions - the latter of which comes in hundreds of different color variations - which range from bright yellow and orange to the bi-colored ones like
Ruby Frost
and Route 66
As well as a wide variety of tuberous perennials like Agapanthus, Cannas, Iris and of course all the lily family including
The Daylily - which apart from being spoilt for choice when it comes to colors - very quickly multiplys and establishes its self
and of course Liatris which is extremely hardy and can withstand both intense heat as well as intense cold and comes in shades of pink . lavender and white
Hopefully you now have enough of a choice to get you going and planning your perennial garden - but should you need a wider choice or further help please feel free to ask - as there are many, many more that I could recommend too