"Not MPC" I read as not my personal choice. I agreed. I prefer to keep plants in separate pots, 1. so that you can control watering especially, 2. because they will grow at different rate and soon look unbalanced, 3. other microclimate reasions.
Cacti don't need a food-rich compost. Just fast draining. JINo1 certainly strong enough with an equal qhantity of hoticultural grit (sand is OK but must be horticultural grade too). I prsume cat liitter could be anything.
Drainage after repotting needs special care. More compost, damaged roots.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Steve ... Mike ... It's not worth trying too hard to save money. I'm not a cat fan, I don't understand the word "molar". To me it means teeth or related to the chemical unit a mole.
Does "very basic" mean high pH; it might be. I use horticultural hydroleca in my bonsai mix. Builders' LECA is high pH.
The label John Innes does not mean what it once did. I have a bag that is some 90% organic.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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Cacti don't need a food-rich compost. Just fast draining. JINo1 certainly strong enough with an equal qhantity of hoticultural grit (sand is OK but must be horticultural grade too). I prsume cat liitter could be anything.
Drainage after repotting needs special care. More compost, damaged roots.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
It has to be molar clay cat litter, that's why I stick with grit mixed 50:50 with Hohn Innes No. 2 or 3 depending what I have to hand.
Does "very basic" mean high pH; it might be. I use horticultural hydroleca in my bonsai mix. Builders' LECA is high pH.
The label John Innes does not mean what it once did. I have a bag that is some 90% organic.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
https://www.kaizenbonsai.com/premium-bonsai-compost-no3-superior-drainage-mix-with-biochar
No but i had just recently watered them as i do this once a month except winter when i don't water them.
Adding just the right amount of water to pots without drainage would work with care and experience, but would be dodgy at repotting time.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."