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I like that SSR, so the Orchard artwork is the trees, just enough for maybe a 2 or 3 squads and anyone else should be in open ground is my thinking, you need a set limit of how much that few woods in a hex can provide cover for in squad equivalents, with 4 little pieces of woods in each hex, might be just enough to hide a gun crew, it's gun and provide cover for a squad. 2 squad limit for the cover, anyone over 2 squads is in open ground, at least that is my reality argument.
OR, just make orchards as light woods/jungle in an SSR, affects the whole hex and don't worry about it. We need a couple more wooded boards to portray what you are getting at but I would only SSR Orchards to something else ONLY IF that is your last option. My 27 years of publishing have taught me to not make too much of terrain SSR changes, players hate those and it gets worse the more verbiage you have in an SSR. Just keep that in mind, I've had several subscribers say they won't play scenarios with many Terrain changes and I know why. Many players forget what the changes were in the heat of the game. Good luck whatever you decide.