Rainbow-bright blooms and leafy lushness are your best bets for a summer wedding. How to bask in the boldest hues? Take a crash course in color from flower whisperer Livia Cetti.

Plum & Violet
Wedding centerpiece of allium, clematises, wheat grasses, wild sweet peas, and columbines, $300.

Vibe + Venue: "The sensibility here is a little bit country, a little bit urban, and totally wild and windswept—ideal for an artsy outdoor party in a sculpture park. This is an in-between summer-and-fall arrangement, thanks to the wheat and seed pods."

Tablescape Tip: "Rent blue-gray linens and cream-colored stoneware, and hang calligraphed table-number cards from the pitchers' handles. I'd go for an informal script-y style."

Palette Plan: "A bramble of unusual dark purple blooms gives this arrangement a complex look. For something a lot softer in a comparable color, go for big, fluffy pastel hydrangeas."

Similar Look, Different Flowers: "Larkspurs in summer, delphiniums in spring, and anemones in winter."

Browse more purple wedding centerpieces.