Quoted from above in regard to spraying ammonia, "You can use any strength you want it will not hurt the plants,"
NO,NO, NO! If it is too strong, you will risk burning the plants if you spray it on the foliage. 1:10 should be OK. It's ideal for an early season drench. 1:20 should work too to actually spray slugs. But after the hostas unfurl, please, no stronger that 1:10.
