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, 12 months ago. Viewing 1 post (of 1 total) Author Posts April 27, 2008 at 9:00 pm #27740 Anonymous Hi gardenhoes – No, I’ve only pruned the stalks with no growth or leftover blossoms/leaves from the previous year. I was always hesitant to prune them when I saw buds on them! Were you referring to pruning back in the fall or spring/late winter? Mike Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.