This theme is one of my favorite “simpler” themes. It comes across a little “cutesy” as opposed to being overly sophisticated, but still fun and quaint.
I would start by sending out invitations that have floral, or greenery on them-even butterflies help give off that garden atmosphere.
Your ceremony site can be many options, but remember to stick with a more simple look-white chairs, simple aisle, and simple altar whether you want to lean a bit more rustic, or keep it traditional.
This theme allows for many options for dresses. The only thing I would stay away from especially if you are having it outdoors, is a super traditional ball gown (especially satin) or any dress with a long train. Satin comes across too fancy and you will look out of place, and a really long cathedral train will just end up with grass stains all over it-not the look you want. Try something like this
Your reception decor should stay simple-like the ceremony. Think light colors, lots of floral (more garden wildflower kind as opposed to the traditional calla lilies and roses. I think these tables and centerpieces are gorgeous
The cake should keep with the simple and minimalistic theme of garden party but add some garden accents: floral, butterflies, birds, etc. Keep it cute, but still bridal.
Enjoy your simple yet pretty garden themed wedding!!