Jim Webb (now deceased) always advocated limestone or dolomite for figs. He claimed that it helped with cold tolerance. Like Brian, I have used it regularly and it certainly does not do them any harm. I sprinkle a light dusting (like icing sugar on a sponge cake?) over the soil surface in autumn. Maybe I should use it a little more often if Brian's figs are happy with monthly doses.
With regards to Dolomite, my understanding of it previously was that it does raise the ph so for species that like a slightly acidic environment, is adding dolomite not detrimental over the long term.?
Dolomite does raise the pH but there are many other factors at play - composition of the potting mix; starting pH of the mix; etc. The pH of your mix can also change over time as a result of fertiliser - N ferts tend to acidify soils so in some cases adding a little dolomite could be beneficial. You'd need to do some testing to find out what the current pH of your mix is to decide.
pH of the water you use can affect the acidity of the soil as well but could push pH either up or down. Most towns have treated water which is pH balanced and should not affect your plants but people relying on ground water or untreated dam water can have issues. At my previous property the well water measured pH 4.5 and dissolved the copper hot water tank
I could grow most plants but, strangely, azaleas did not do well there.
Maybe I'm overdoing the chemistry a tad here
Unfortunately when it comes to soil chemistry there are so many interactions it is often not as simple as it may seem.
