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 9 years, 1 month ago. Viewing 1 post (of 1 total) Author Posts April 27, 2008 at 9:00 pm #27747 Anonymous Mike – I found the website to the Endless Summer variety… http://endlesssummerblooms.com/ Everything you ever wanted to know about Endless Summer but were afraid to ask! Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.