The butterflies have enjoyed my window boxes which have trailing purple Lantana, Geranium, & purple Petunia. The coconut liners dry out too fast. I will line them with plastic next year. If you would like to do this combination, look for "Blue" Geranium. It is not what I have, but it would match the Purple Lantana and Petunias very well. Live & Learn.  :)

Light Purple Petunia

Penta behind Flat Leaf Parsley

Zinnia

Zinnia

Victoria Blue -Perennial, buy as a plant, easy to grow and beautiful. 

Snapdragon, primarily a spring flower in the south. It will not do well in the humid heat of the summer. The snapdragon is a host plant from some smaller butterflies and that is why I have grown it, but it is not doing well as expected.

Lantana Bandanna, it actually changes color during the day.

Hot Pink Petunia

Purple Trailing Lantans

Homestead Verbena

Purple Homestead Verbena putting on a show

Purple Chrysanthemum 

Verbena

Penta

Window box with Lemon Drop Verbena (middle), Purple Trailing Lantana, & Hot Pink Petunia

Petunia - If you deadhead you will get a lot more flowers. You must cut the stem the flower is on or it will still set seed.

Purple Trailing Lantana

Marigold. Grown by my 11y/o daughter. She is very proud of her Marigolds. They are a great option for kids to grow from seed. They get big and are so easy to grow. The kids swell with pride.  :)