- Mon Jul 26, 2021 11:17 am
I have largish quantities in my in-ground bogs that I refresh every couple of years or so, so I don't have to replace it.
I use sulphur chips for a reasonably quick reduction in PH (don't overdo it or you will burn the plants with a too low PH, and it doesn't drop the PH straight away, so if you test it, wait for a month or so in warm weather, longer in cold weather) and pine bark for a longer-term addition of tannins and slow acid release as it rots.
Its not as good as new media but hey it's in-ground bogs in Uk so Im never likely to get specimen plants, but its more than good enough for 'standard' plants.
With small quantities, it will be more difficult as you won't have the mass of substrate to absorb any overtreatment.
Vinegar and organic acids only work short term.