some of you are discussing soilless mixes just like professional chemists. I am impressed but can't really follow as I am not. I grow some cacti soilless, some with soil & pumice, some with soil only, some with soil + pine bark (somehow I would never touch fir bark), & so on. Usually I read up everything I can about a plant before repotting & then mix together what I think might hopefully be the perfect mix.
Today I searched for affordable pumice & stumbled upon this site -- I add the link for other people in Germany. Pumice is sold there eg. in 25l-bags. They also offer tuff in bags, but in small bags of 5l only. They write:
Diese hochwertige Vulkanasche gilt als sehr fruchtbar und stellt die entsprechenden Mineralien der Pflanze sofort zur Verfügung.
Tuff Vulkanasche: Ein Segen für den Garten und Ihre Pflanzen haben dank des Mineralgehalts einen äußerst hohen bodenverbessernden Wert.
Dort wo Tuff eingesetzt wird werden Ihre Pflanzen mit Sicherheit mit schneller Geschwindikeit gedeihen und aufblühen.
Tuff ein sehr wertvoller Dünger und enthält wichtige Nährstoffe wie Phosphor, Calium und Calcium.
Einsatz
Tuff kann unter anderem als Zuschlagsstoff für eine hochwertige Kakteenerde verwendet werden.
Do you use tuff in your mixes? If so:This high quality volcanic ash is considered very fertile and immediately provides the appropriate minerals to the plant.
Tuff volcanic ash: a blessing for the garden and your plants have an extremely high soil improving value thanks to the mineral content.
Where tuff is used, your plants will certainly flourish and blossom with rapidity.
Tuff is a very valuable fertilizer and contains important nutrients such as phosphorus, calium and calcium.
Use
Tuff can be used, among other things, as an additive for a high quality cactus soil.
Translated today with www.DeepL.com/Translator -- lazy me...
* For which plants?
* In which quantities? Like: 1spoonful per 2l-pot, or 20% of the mixture, or...?
Thank you.
Nachtkrabb
To me this question is a bit crazy as I know tuff in the form of building blocks. The romans loved it, transported it from Germany to Italy for quality reasons, & their buildings partly still stand after 2T years. The Suebians in the South-West of Germany have always used it as a local, very reliable and durable building material. And now putting THAT into my cacti pots..?! Crazy.