When choosing flowers for the front garden, the criteria includes the bloom color being purple, yellow or white.
I have moved flowers that turned out to be orange or blue in hue. They are happily living in the back garden.
Purple and yellow are complimentary colors. They are opposite each other on the color wheel. The white is a nice highlight.
Here is a list of the blooming perennial plants in the front garden.
Purple:
Iris
Russian Sage
Hosta 'Blue Eyes'
Chrysanthemum
Salvia
Yellow:
Chocolate Flower Berlandiera lyrata 'Mora County Mix'
False Sunflower Heliopsis helianthoides
Yarrow Achillea x 'Moonshine'
Jerusalem Sage Phlomis russeliana
White:
White Coneflower Echinacea purpurea 'White Swan'
Soloman's Seal
Heath Aster
Daisy
In addition, I have some purple and white larkspur which self seeded.
I confess, I pulled two pink larkspur plants.
In the spring, the flowering bulbs are also purple, yellow and white.
Purple:
Tulips 'Demeter'
Crocus Botanical Crocus Mixed
Giant Allium Allium x ambassador
Grape Hyacinth Muscari 'Armeniacum'
Tulips 'Demeter'
Tulips 'Demeter'
Yellow:
Daffodil
Crocus Botanical Crocus Mixed
Darwin Hybrid Tulipa 'Golden Peldoorn'
White:
White Glory Of The Snow Chionodoxa luciliae 'Alba'
Crocus 'Peter Pan'
Crocus 'Snow Bunting'
Crocus Botanical Crocus Mixed
There are also spring flowering shrubs.
Purple:
Lilac
Yellow:
Lynwood Gold Forsythia Forsythia x intermedia 'Lynwood Gold'