Trees give off pollen, which is where the allergies come from. If you want to verify that, call your son's allergist. The floors will also be finished with a hard sealant.
I wouldn't take any chances. Go with a different wood. But yes, hard flooring is best for families dealing with allergies. If your children have bad allergies, choose something with no VOCs
There are so many kinds of hardwood flooring to choose from why would you even consider hickory if your son is allergic to it?
To be on the safe side, don't buy hickory.
Need help with my living room
Allergen free redesign
Unique wall idea
Dark shows dust
Mid tones are very popular as a "dark" option. It offers the drama of a dark hardwood with the benefits of lighter hardwood. Very easy to live with.
I'm fan of natural finish...but not all homes work with light/bright hardwood. If you have a very open/airy space that is naturally light/bright, you can work with a mid-tone hardwood (like a caramel or mushroom brown) to anchor the space with some depth of colour.
Get a different wood.
My mother was allergic to pine, and could not be around pine furniture. They bought teak .
It took me ten years to figure out as an adult why my allergies are non stop when I visit my moms custom home. This morning I figured it out. Pine floors. We eliminated feathers, my seasonal allergies and there are no other triggers apparently in this house. I have to take the max allergy meds per day to be here.
Treating the floor did not stop this from.happening to me as my allergies are severe. So heads up guys, people can react to the wood flooring even after its treated