Are the fireflies out yet where you live? An odd chemical reaction in their bodies causes the effect we like so much to sit and watch in the evening.
If you do happen to be someone who enjoys being outside as the evening begins to cool down, consider planting groups of white flowers around your sitting area. The white will make them glow and be visible longer than other shades.
Moonflower, an attractive vine, is an excellent option for an evening garden. So, too, are basics like the tried and true white petunia. There are several good options among our perennials.
Source of Information on Gardening best seen at Night