Do: consult with a florist. Most good florists are happy to help you whittle down that initial flower bill with ways to include flowers for the ceremony venue and inside the barn - often using 1 beautiful arrangement for the ceremony, and then moving it inside to a focal table for the reception. They will help you to make your floral budget a reality. If they don't, consult another florist.
Do: splurge on the bridal bouquet and, to a lesser degree, on the bridesmaids bouquets. These can also be placed in beautiful containers in a special place-like beside your guest book as friends enter to write a special wish (and remember to include enough space in whatever you use as a guest book so they can write a sentence or two of well wishes). Also, have the florist include at least one of your favorite flowers in your bouquet if they are in season. Flowers that aren't in season will cost more than those that are readily available.
Don't: feel that you have to purchase all of your flowers from a single vendor. Many farmers' markets have beautiful blooms available. Check those markets, as well as grocery stores and wholesale clubs several months in advance to see what will be available in the season you say your marriage vows. If you can DIY a few blossoms into a glass vase, a small paint can from a hardware store, or even into a rustic Mason jar, then these will be very pretty sitting down the aisle and then on a few guest tables.
Don't: assume that you need flowers on every table at the wedding reception. Use flowers on every other table and the room will still have that freshness and beauty that flowers offer.
Do: Make use of the many decorations offered by venues such as The Barn at Love Farms for the other table and ceremony site decor. Lanterns, candles, vases and centerpiece holders go a long way in making your wedding unique.
Do: Use lots of greenery. It can be a very budget friendly and beautiful accessory. Imagine lots of greens with just a flower or two added in.
AND MOST OF ALL: DO Make it fit your own personality and enjoy your wedding day. Your memories will be beautiful!