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Apr 15, 2017 4:15 PM CST
Is it safe to use 12-12-12 to fertilize azaleas. I have some azaleas that are old and they are not blooming and have a lot of dead branches. Thank You
Name: Dave
Southern wisconsin (Zone 5b)
Region: Wisconsin Peonies Bulbs Seed Starter Pollen collector Plant and/or Seed Trader
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Apr 15, 2017 4:54 PM CST
They have fertilizer for azaleas. I believe you can use a fertilizer with a higher acid percentage. (Middle number)
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Apr 15, 2017 5:34 PM CST
Welcome! rosalpina.

You probably could use it if that's what you already have although it might not be ideal depending on your soil. As Dave said there are acidifying fertilizers (which would relate to the first number - the form of nitrogen - rather than the middle number which is phosphorous). The Mircle Gro fertilizer for acid-loving plants, for example, is 30-10-10 and has nitrogen in the acidifying forms of ammonium and urea. But your soil may already be acidic enough, do you know your soil pH?

If you can post pictures of your azaleas we may be able to help more, it maybe that there are other things that can be done to rejuvenate them.

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