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See more questions on Acid Soil Beds

lowering PH level

I have a blue Hydrangea growing in a large tub of Ericaceous compost (it was blue when I bought it last year). The label says the PH level should be 4.5. I checked the compost and the level is 6+ and the flowers this year are red. How do I lower the PH to get it to 4.5? henlen, , Co Kildare Posted: 02/07/2017

This is difficult to do successfully, easier the other way.

See information at:  http://www.garden.ie/howtogrow.aspx?id=316

Water with rainwater as it is lime-free. 

 

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