How romantic to hold your wedding ceremony outside! All you need is a lovely garden, village green or indeed a wood - and, ideally, a Plan B.
Flowers in the garden need to be big, bold and robust to hold their own both visually and to physically stand up to the various types of weather - be it bright sunshine, drying wind or a downpour. They must look very natural too to stay in keeping with their surroundings. I was delighted to be involved with 4 outdoor weddings in 2016 throughout the summer - one in each of May, June, July and August. For the florist, garden weddings involve an early morning flurry of activity as arches are adorned, swags hung, and lights and candles dotted about the place to illuminate the evening party.
As for the Plan B: you ideally need an alternative space, and lots of umbrellas on hand! And yes, one of the four did make use of their indoor space for a part of the day until the sun came out again.