flower seeds you can plant in late August and September

Dianthus and hollyhocks seeds are my favorites to start in the fall. They grow their root system and leave during this time but will not get flowers until spring

How about- daisies, poppies, brown eyed susans, moon flowers, zinnias, mums, swiss chard, ,,,

 You could always give herb seeds. Basil, rosemary, oregano and chives are some of the easiest to grow indoors on a windowsill. Nasturtium is a flowering herbn and on

One usually plants bulbs, such as tulips, daffodils, crocus, etc., in the fall. They then bloom annually in the spring

Your cool annuals like petunias, pansies, flowering kale, maybe snapdragons, calendula.

Flower Bulbs

August is a great time to plant those fall flower bulbs. There are many varieties that can be planted this fall and start blooming early spring. Flower Bulbs

http://www.ufseeds.com/What-to-Plant-Now_85b60b42bd4546.html

http://www.ufseeds.com/Flower-Bulbs_82a8ad2.html