some of my most severe allergies are caused by things that release pollen around September so the honey I buy may not contain the stuff that prevents those allergies.
I was just talking to someone yesterday about this fact. What you want to try to find is a fall honey. Some beekeepers collect honey at different times of the year (Spring, Summer, and/or Fall). Each will be a different color and have a different flavor based on what flowers/trees are out at those times. Many beekeepers do not collect spring honey, because at those times, their bees are putting away stores in their brood chamber. They want the brood chamber full so they can focus on late spring/summer honey collection. But those that do make spring honey get a very light colored (sometimes close to clear) and very floral tasting. Black Locust is a good producer of nectar for honey in the spring. Many keepers also feed their bees (sugar water) in the spring to help them boost their stores quicker, and ensure the bees always have a source of 'nectar' even if the weather is bad and they aren't going out foraging. You never want to be collecting honey if you are feeding. You get what we call funny honey, because it's made from sugar water.
Most focus on the summer honey, which is usually heavy in clover, but depending on the location could have a nice floral taste as well. Summer honey is the typical Light to dark amber color.
Fall honey again, can be rare because not everyone collects it, for a couple reasons. One reason is that when the summer harvest is complete, many keepers immediately start treating their hives for mites. You can't be collecting honey white treatments are in place. Also, in the summertime we often hit a dearth, where nothing is blooming so the bees have nothing to bring in. During that time they are using up their stores and often are being fed to supplement. When the fall flow hits, they are letting the bees keep it all, so they can put away enough stores to get them through the winter. Those who do collect fall honey get a darker honey from dark amber to brown, that is very rich and sweet, but not much depth of flavor (depending). It can have an off-putting fragrance depending on what is blooming (like goldenrod). But this is what you want to seek out for help with your fall allergies.
Here one example of summer and fall honey colors:
I am most interested in how your local garden will influence the flavor of your honey and any mead you produce.
I didn't do a garden at all this year, but hope to next year. I wouldn't think that anything in the garden would be enough to really affect the taste of the honey. The area of the garden is so small in comparison to the total area they cover. It takes a trip to 2 million flowers to make 1 pound of honey. The number of flowers in my garden is insignificant by comparison.