Spring and summer are usually when the desert’s native plants put out flowers in a desperate attempt to reproduce. Even a moderately abundant bloom can be spectacular, as the desert landscape sports accents in yellow, purple, pink, blues and orange. But plants aren’t the only living things adding color to the desert as they attempt to pass on their genes to a next generation. Where there are desert flowers, there are desert butterflies, and it’s unusual to see the Arboretum in bloom without at least a few interesting lepidopteran critters flitting from flower to flower. Space is limited; pre-registration required.