I have never burned my hostas with the ammonia, but those of you who were on DG might remember Sandy - Sanannie. She's got a fab. garden and she burned some of hers using a stronger solution of ammonia. Memory does not serve me as to how strong. But bottom line, 1:10 will do the job. Likely even 1:20 will do the job. The stronger the solution, the more ammonia you will need to buy; so why use a stronger solution than necessary?
