Amaranthus pops up quickly and gets very large, very fast. I like both the magenta and lime. I tried something new this year that I LOVED - Purple Violet Tubeflower, also big. I've never grown it from seed, so we'll see how that goes. Nasturtium and Nicotiana are always on my list as are Zinnias and Cleome.
I love nasturtiums. My mother says that nasturtiums are the most loyal plants and she could grow anything. Vogue once asked if they could do an article on her house and garden in Vogue Living. 10 plants you can't kill gallery 3 of 10 - Homelife