Fertilizer for hydrangeas? Home › Forums › Organic-Gardening Questions › Compost, Mulch, Soil Prep, Fertilizer › Fertilizer for hydrangeas? This topic contains 0 replies, has 1 voice, and was last updated by Anonymous 8 years, 6 months ago. Viewing 1 post (of 1 total) Author Posts April 27, 2008 at 9:00 pm #27725 Anonymous Thank you Margaret –That answers a lot of questions. I’ll check into the organic fertilizer and consider the location and light conditions. I’ll settle for "waist-high" hydrangeas! Thanks again, Mike Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.