Wow, do we have the same issue. Love, love, love gardening and flowers of all sorts, but my skin is so damn touchy about scraps, prickles, abrasions etc. Add the heat and humidity and sunblock and I'm lucky if I survive any gardening session without running for the heavy duty allergy meds and a variety of supposedly soothing lotions.

I did get my GP to prescribe the mega dose extra strength Reactine for such emergencies. It's supposedly the best allergy med for skin reactions.

The other thing I find helpful is crushing regular aspirin and making a past of it and applying it to my wounds/injuries. It helps a lot.