Invoke inner peace, enhance mental powers, concentration, endurance, money, fertility.
Money is the primary magickal power of Oat straw. Perhaps it has to do with the harvests because obviously if your crop was very good, you made more money. Oat straw gives help in spell work. It is also excellent in fertility spell work.
A way to implement Oat straw in magick is by using it in witch bottles or sachets, along with other herbs/flowers/resins/woods to help with fertility or finances.
You can also make use of Oat straw for its rejuvenating properties in the form of a ritual bath or as a ritual cup of tea to invoke inner peace, enhance mental powers, concentration and endurance.
Disclaimer: May have physical benefits. Always talk to your doctor before using herbal supplements. Some herbs may have side effects when mixed with over the counter medications. Herbal supplements do not replace your prescription drugs.