Let’s address the “in season part” of the question. With the global economy the term “in season” isn’t as binding as it once was since most flowers are available year round. However, during specific periods of time certain flowers are more expensive. I am going to list flowers that are considered “in season”, but remember if you love a flower that is not on the list it is probably available.

Alstroemeria Bells of Ireland Chrysanthemum English lavender Forget-me-not
Freesia Gerbera daisy Hydrangea Iris Larkspur
Liatris Lily (Asiatic & Oriental) Lisianthus Matsumoto Aster Monte Casino Aster
Queen Anne’s Lace Snapdragon Solidastor Statice Stephanotis
Stock Sunflower Tuberose Yarrow Zinnia
Rose

Now the tricky part is which ones you can find that are eco-friendly and inexpensive. The trend of eco-friendly flowers is new and as a result the price for eco-friendly flowers reflect that newness. Unless a particular florist can buy eco-friendly flowers in large quantities, the flowers may be a little pricey. However, there are florists across the nation embrassing the “green” movement”. I’m not sure where in the north west you live, but I would call around and speak to your local florists to find out the availability of “green” flowers. The easiest way to do this is to use the Flower Shop Network florist directory. Find your city and begin your search.

The other thing you can do to have an eco-friendly wedding is to incorporate potted plants in your wedding decorations. A local garden center or nursery will have many of the same flowers you are using as fresh cut stems for your wedding bouquets and corsages. Use potted snapdragons or gerbera daisies on your reception tables. As guests leave, they can take the potted flowers home as wedding favors. Or find eco-friendly wedding favors like the ones from Go Green Tree Beginning Favors. They have tree seedling that can be given as party favors. Guests can take them home and plant a reminder of your wedding while promoting the environment.