Yes, Pennington All Purpose Fertilizer 10-10-10 can be used on hibiscus.
Granular fertilizers generally have a shelf life of 3 years if stored in cool dry place in an airtight container or securely closed. Do not keep stored in areas where there is alot humidity or exposure to extreme heat or freezing temps.
Please note: Pennington All Purpose Fertilizer 10-10-10 is now discontinued.