High-pressure sodium lamps
Landscape light bulbs give a nice feel to any house, and also to your garden. Your flowers will look perfect even in the night.
Outdoor lighting can also improve plant growth.
Flowering plants needs a powerful light source, like a high-intensity discharge lamp or a halogen one. For flowers to bloom, you can install some high-pressure sodium lamps, that provide a red-spectrum light.
Carefully handle high-pressure lamps as they can blow up when dropped. The lights will need to be left 14 to 16 hours on, to help your plants. They will add a few dollars to your electricity bill, but at least you will have a wonderful garden and home.